Handling error in Custom query widget

app.py

@@ -49,9 +49,13 @@ class DomState:
             question=question,
             question_category=question_category
         )
-        if self.index_type in ['FAISS', 'Chroma']:
-            self.sources_relevant_paragraphs = [doc.metadata for doc in self.relevant_paragraphs]
-            self.relevant_paragraphs = [doc.page_content.replace('\n', '').replace('\t', ' ') for doc in self.relevant_paragraphs]
+        # Index may not be found if there are no data ingested for the given question_category. In that case, display the warning message.
+        if not self.relevant_paragraphs:
+            self.relevant_paragraphs = f'Index for {question_category} not found. That means no PDFs, Text files, or URLs have been ingested and indexed so far. Ingest the new data for {question_category} and then querying again.'
+        else:
+            if self.index_type in ['FAISS', 'Chroma']:
+                self.sources_relevant_paragraphs = [doc.metadata for doc in self.relevant_paragraphs]
+                self.relevant_paragraphs = [doc.page_content.replace('\n', '').replace('\t', ' ') for doc in self.relevant_paragraphs]
         return self.relevant_paragraphs
     
     

src/langchain_utils.py

@@ -669,6 +669,10 @@ class LANGCHAIN_UTILS:
         # Get the index of the given question_category
         index = self.index_category_doc_type_wise_index[question_category][constants_utils.INDEX_CATEGORY_MASTER_INDEX_DOC_TYPE]
 
+        if not index:
+            logger.error(f'Index for {question_category} not found! That means no PDFs, Text files, or URLs have been ingested and indexed so far. Ingest the new data for {question_category} and then querying again.')
+            return response
+
         if self.index_type == 'FAISS':
             response = index.similarity_search(
                 question,