Fix the same issue in the python.

Author: nedtwigg

python/selfie-lib/selfie_lib/EscapeLeadingWhitespace.py

@@ -34,7 +34,7 @@ def appropriate_for(cls, file_content: str) -> "EscapeLeadingWhitespace":
 
         for line in file_content.splitlines():
             whitespace = "".join(c for c in line if c.isspace())
-            if not whitespace:
+            if whitespace == "" or whitespace == " ":
                 continue
             elif all(c == " " for c in whitespace):
                 whitespace = " "