Return helpful error when an empty list of docs are imported.

Author: kishorenc

examples/collection_operations.py

@@ -2,7 +2,7 @@
 import os
 import sys
 import typesense
-
+from typesense.exceptions import TypesenseClientError
 
 curr_dir = os.path.dirname(os.path.realpath(__file__))
 sys.path.insert(1, os.path.abspath(os.path.join(curr_dir, os.pardir)))
@@ -131,6 +131,13 @@
 # Deleting documents matching a filter query
 print(client.collections['books'].documents.delete({'filter_by': 'ratings_count: 4780653'}))
 
+# Try importing empy list
+try:
+    import_results = client.collections['books'].documents.import_([], {"action": "upsert"})
+    print(import_results)
+except TypesenseClientError as e:
+    print("Detected import of empty document list.")
+
 # Drop the collection
 drop_response = client.collections['books'].delete()
 print(drop_response)

typesense/documents.py

@@ -74,6 +74,9 @@ def import_(self, documents, params=None, batch_size=None):
                 for document in documents:
                     document_strs.append(json.dumps(document))
 
+                if len(document_strs) == 0:
+                    raise TypesenseClientError(f"Cannot import an empty list of documents.")
+
                 docs_import = '\n'.join(document_strs)
                 api_response = self.api_call.post(self._endpoint_path('import'), docs_import, params, as_json=False)
                 res_obj_strs = api_response.split('\n')