Label printing errors (#6450)

* Enhance error handling for label printing

* Better feedback in forms

* Raise error to user - no need to log

InvenTree/label/api.py

@@ -4,6 +4,7 @@ from django.core.exceptions import FieldError, ValidationError
 from django.http import JsonResponse
 from django.urls import include, path, re_path
 from django.utils.decorators import method_decorator
+from django.utils.translation import gettext_lazy as _
 from django.views.decorators.cache import cache_page, never_cache
 
 from django_filters.rest_framework import DjangoFilterBackend
@@ -13,6 +14,7 @@ from rest_framework.request import clone_request
 
 import build.models
 import common.models
+import InvenTree.exceptions
 import InvenTree.helpers
 import label.models
 import label.serializers
@@ -232,9 +234,14 @@ class LabelPrintMixin(LabelFilterMixin):
         # At this point, we offload the label(s) to the selected plugin.
         # The plugin is responsible for handling the request and returning a response.
 
-        result = plugin.print_labels(
-            label, items_to_print, request, printing_options=request.data
-        )
+        try:
+            result = plugin.print_labels(
+                label, items_to_print, request, printing_options=request.data
+            )
+        except ValidationError as e:
+            raise (e)
+        except Exception as e:
+            raise ValidationError([_('Error printing label'), str(e)])
 
         if isinstance(result, JsonResponse):
             result['plugin'] = plugin.plugin_slug()