[fix] covering scenario where is a string

Debanjan · Debanjan · commit 49af5abadda3 · 2019-03-30T12:59:19.000+01:00
diff --git a/influxdb/_dataframe_client.py b/influxdb/_dataframe_client.py
@@ -385,7 +385,7 @@ def _convert_dataframe_to_lines(self,
         # Generate line protocol string
         measurement = _escape_tag(measurement)
         # prepend comma to non-Null tag-rows
-        tags = ("," + tags).str.replace(r"^,$","")
+        tags = pd.Series("," + tags).str.replace(r"^,$","")
         points = (measurement + tags + ' ' + fields + ' ' + time).tolist()
         return points
 
