Fix an issue where recursion is broken due to no new line chars

Author: cslzchen

mfr/extensions/tabular/libs/stdlib_tools.py

@@ -123,6 +123,11 @@ def _trim_or_append_data(fp, text, read_size, sniff_size):
     :return: the first row of the file in string
     """
 
+    # Return on empty text. This handles the corner case where the CSV is empty or one line where
+    # no new line characters can be detected.
+    if len(text) == 0:
+        return ''
+
     # Try to find the first new line character in the text chunk
     index = _find_new_line(text)
     # If found, return the trimmed substring