scripts: last space/blank line issues detected by flake8

scripts/check_language_files_not_BOM.py

@@ -15,7 +15,7 @@ import sys
 
 def is_BOM_encoded_file(path):
     """ Returns whether |path| is a file that is encoded in UTF-8 with BOM. """
-    if  not os.path.isfile(path):
+    if not os.path.isfile(path):
         return False
 
     with open(path, 'rb') as f:

scripts/check_trailing_whitespaces.py

@@ -14,6 +14,7 @@ import sys
 
 TRAILING_SEQUENCE = re.compile(r'[ \t][\r\n]')
 
+
 def has_trailing_whitespace(path):
     """ Returns whether |path| has trailing whitespace. """
     if os.path.isfile(path):
@@ -26,7 +27,6 @@ def has_trailing_whitespace(path):
     return False
 
 
-
 if len(sys.argv) > 2:
     sys.exit('Usage: {} [root]'.format(sys.argv[0]))