Fix error handling for first empty filter response (#3516)

changedetectionio/processors/text_json_diff/processor.py

@@ -324,13 +324,13 @@ class ContentProcessor:
                     append_pretty_line_formatting=not self.watch.is_source_type_url
                 )
 
-            # Raise error if filter returned nothing
-            if not filtered_content.strip():
-                raise FilterNotFoundInResponse(
-                    msg=self.filter_config.include_filters,
-                    screenshot=self.fetcher.screenshot,
-                    xpath_data=self.fetcher.xpath_data
-                )
+        # Raise error if filter returned nothing
+        if not filtered_content.strip():
+            raise FilterNotFoundInResponse(
+                msg=self.filter_config.include_filters,
+                screenshot=self.fetcher.screenshot,
+                xpath_data=self.fetcher.xpath_data
+            )
 
         return filtered_content
 

changedetectionio/tests/test_filter_exist_changes.py

@@ -93,7 +93,9 @@ def test_filter_doesnt_exist_then_exists_should_get_notification(client, live_se
         "tags": "my tag",
         "title": "my title",
         "headers": "",
-        "include_filters": '.ticket-available',
+        # preprended with extra filter that intentionally doesn't match any entry,
+        # notification should still be sent even if first filter does not match (PR#3516)
+        "include_filters": ".non-matching-selector\n.ticket-available",
         "fetch_backend": "html_requests",
         "time_between_check_use_default": "y"})