Filter not found should save error screenshot

changedetectionio/processors/text_json_diff.py

@@ -21,7 +21,8 @@ description = 'Detects all text changes where possible'
 json_filter_prefixes = ['json:', 'jq:', 'jqraw:']
 
 class FilterNotFoundInResponse(ValueError):
-    def __init__(self, msg):
+    def __init__(self, msg, screenshot=None):
+        self.screenshot = screenshot
         ValueError.__init__(self, msg)
 
 
@@ -188,7 +189,7 @@ class perform_site_check(difference_detection_processor):
                                                                        append_pretty_line_formatting=not watch.is_source_type_url)
 
                     if not html_content.strip():
-                        raise FilterNotFoundInResponse(include_filters_rule)
+                        raise FilterNotFoundInResponse(msg=include_filters_rule, screenshot=self.fetcher.screenshot)
 
                 if has_subtractive_selectors:
                     html_content = html_tools.element_removal(subtractive_selectors, html_content)

changedetectionio/update_worker.py

@@ -340,6 +340,7 @@ class update_worker(threading.Thread):
 
                         err_text = "Warning, no filters were found, no change detection ran - Did the page change layout? update your Visual Filter if necessary."
                         self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text})
+                        watch.save_screenshot(screenshot=e.screenshot, as_error=True)
 
                         # Only when enabled, send the notification
                         if self.datastore.data['watching'][uuid].get('filter_failure_notification_send', False):