fix: gen wordcloud only for non-empty cols (#1459)

Author: alexbarros

src/ydata_profiling/model/pandas/describe_categorical_pandas.py

@@ -183,7 +183,7 @@ def word_summary_vc(vc: pd.Series, stop_words: List[str] = []) -> dict:
         stop_words = [x.lower() for x in stop_words]
         word_counts = word_counts.loc[~word_counts.index.isin(stop_words)]
 
-    return {"word_counts": word_counts}
+    return {"word_counts": word_counts} if not word_counts.empty else {}
 
 
 def length_summary_vc(vc: pd.Series) -> dict: