Fix expected type from cypher projection result_df.squeeze()

Author: FlorentinD

graphdatascience/graph/graph_cypher_runner.py

@@ -2,7 +2,7 @@
 
 import re
 from itertools import chain, zip_longest
-from typing import Any, Optional
+from typing import Any, Dict, Optional
 
 from pandas import Series
 
@@ -45,9 +45,9 @@ def project(
 
         GraphCypherRunner._verify_query_ends_with_return_clause(self._namespace, query)
 
-        result: Optional[Series[Any]] = self._query_runner.run_cypher(query, params, database, False).squeeze()
+        result: Optional[Dict[str, Any]] = self._query_runner.run_cypher(query, params, database, False).squeeze()
 
-        if result is None or result.empty:
+        if not result:
             raise ValueError("Projected graph cannot be empty.")
 
         try:
@@ -57,7 +57,7 @@ def project(
                 f"Invalid query, the query must end with the `RETURN {self._namespace}(...)` call: {query}"
             )
 
-        return GraphCreateResult(Graph(graph_name, self._query_runner, self._server_version), result)
+        return GraphCreateResult(Graph(graph_name, self._query_runner, self._server_version), Series(data=result))
 
     __separators = re.compile(r"[,(.]")