Catch correct exceptions

To catch the exception of duplicate file types, catch only the exception that triggers at this, OPCError. To catch generic file writing errors, catch all of EnvironmentError, not just OSError.

plugins/UFPWriter/UFPWriter.py

@@ -5,6 +5,7 @@ from typing import cast, List, Dict
 
 from Charon.VirtualFile import VirtualFile  # To open UFP files.
 from Charon.OpenMode import OpenMode  # To indicate that we want to write to UFP files.
+from Charon.filetypes.OpenPackagingConvention import OPCError
 from io import StringIO  # For converting g-code to bytes.
 
 from PyQt5.QtCore import QBuffer
@@ -90,7 +91,7 @@ class UFPWriter(MeshWriter):
 
         try:
             archive.addContentType(extension = material_extension, mime_type = material_mime_type)
-        except:
+        except OPCError:
             Logger.log("w", "The material extension: %s was already added", material_extension)
 
         added_materials = []
@@ -130,7 +131,7 @@ class UFPWriter(MeshWriter):
 
         try:
             archive.close()
-        except OSError as e:
+        except EnvironmentError as e:
             error_msg = catalog.i18nc("@info:error", "Can't write to UFP file:") + " " + str(e)
             self.setInformation(error_msg)
             Logger.error(error_msg)