Make all non-inherited classes final

exceptions/updates/MDDuplicateLinkException.php

@@ -5,7 +5,7 @@ declare(strict_types = 1);
  * Exception thrown in case an erroneously duplicate link is to be entered in a
  * linking table.
  */
-class MDDuplicateLinkException extends Exception {
+final class MDDuplicateLinkException extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDFileUploadNotAcceptedException.php

@@ -5,7 +5,7 @@ declare(strict_types = 1);
  * Custom exception class for invalid page parameters, which must be values of a
  * preset list of allowed values.
  */
-class MDFileUploadNotAcceptedException extends Exception {
+final class MDFileUploadNotAcceptedException extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDInvalidCurrency.php

@@ -12,7 +12,7 @@ declare(strict_types = 1);
  * Custom exception class to be raised when trying to use a currency that is not
  * accepted by museum-digital.
  */
-class MDInvalidCurrency extends MDgenericInvalidInputsException {
+final class MDInvalidCurrency extends MDgenericInvalidInputsException {
 
     /**
      * Error message.

exceptions/updates/MDInvalidInputDate.php

@@ -12,7 +12,7 @@ declare(strict_types = 1);
  * Custom exception class to be raised when trying to use a currency that is not
  * accepted by museum-digital.
  */
-class MDInvalidInputDate extends Exception {
+final class MDInvalidInputDate extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDInvalidLengthUnit.php

@@ -12,7 +12,7 @@ declare(strict_types = 1);
  * Custom exception class to be raised when trying to use a length unit that is not
  * accepted by museum-digital.
  */
-class MDInvalidLengthUnit extends MDgenericInvalidInputsException {
+final class MDInvalidLengthUnit extends MDgenericInvalidInputsException {
 
     /**
      * Error message.

exceptions/updates/MDInvalidLicense.php

@@ -12,7 +12,7 @@ declare(strict_types = 1);
  * Custom exception class to be raised when trying to use a license that is not
  * accepted by museum-digital.
  */
-class MDInvalidLicense extends MDgenericInvalidInputsException {
+final class MDInvalidLicense extends MDgenericInvalidInputsException {
 
     /**
      * Error message.

exceptions/updates/MDInvalidObjectPublicationBackground.php

@@ -12,7 +12,7 @@ declare(strict_types = 1);
  * Custom exception class to be raised when trying to use a license that is not
  * accepted by museum-digital.
  */
-class MDInvalidObjectPublicationBackground extends MDgenericInvalidInputsException {
+final class MDInvalidObjectPublicationBackground extends MDgenericInvalidInputsException {
 
     /**
      * Error message.

exceptions/updates/MDInvalidWeightUnit.php

@@ -12,7 +12,7 @@ declare(strict_types = 1);
  * Custom exception class to be raised when trying to use a weight unit that is not
  * accepted by museum-digital.
  */
-class MDInvalidWeightUnit extends MDgenericInvalidInputsException {
+final class MDInvalidWeightUnit extends MDgenericInvalidInputsException {
 
     /**
      * Error message.

exceptions/updates/MDNoUpdateVarSetException.php

@@ -5,7 +5,7 @@ declare(strict_types = 1);
  * Custom exception class for invalid page parameters, which must be values of a
  * preset list of allowed values.
  */
-class MDNoUpdateVarSetException extends Exception {
+final class MDNoUpdateVarSetException extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDTooManyFilesUploadException.php

@@ -11,7 +11,7 @@ declare(strict_types = 1);
 /**
  * Custom exception class for wrongly used files.
  */
-class MDTooManyFilesUploadException extends Exception {
+final class MDTooManyFilesUploadException extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDWrongFileType.php

@@ -11,7 +11,7 @@ declare(strict_types = 1);
 /**
  * Custom exception class for wrongly used files.
  */
-class MDWrongFileType extends Exception {
+final class MDWrongFileType extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDcouldNotSaveException.php

@@ -5,7 +5,7 @@ declare(strict_types = 1);
  * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
  * are not set public.
  */
-class MDcouldNotSaveException extends Exception {
+final class MDcouldNotSaveException extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDcouldNotSetPublic.php

@@ -5,7 +5,7 @@ declare(strict_types = 1);
  * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
  * are not set public.
  */
-class MDcouldNotSetPublic extends Exception {
+final class MDcouldNotSetPublic extends Exception {
 
     /**
      * Error message.

exceptions/updates/MDwriteAccessDeniedException.php

@@ -5,7 +5,7 @@ declare(strict_types = 1);
  * Exception thrown in case the main entity of a page (e.g. an object, an institution etc.)
  * are not set public.
  */
-class MDwriteAccessDeniedException extends Exception {
+final class MDwriteAccessDeniedException extends Exception {
 
     /**
      * Error message.