Fix line spacing

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/checks/base.py

@@ -138,7 +138,6 @@ class Check(object):
         '''
         return weblate.get_doc_url('user/checks', self.doc_id)
 
-
     def check_highlight(self, source, unit):
         '''
         Returns parts of the text that match to hightlight them
@@ -147,6 +146,7 @@ class Check(object):
         '''
         return []
 
+
 class TargetCheck(Check):
     '''
     Basic class for target checks.

weblate/trans/checks/format.py

@@ -214,6 +214,7 @@ class BaseFormatCheck(TargetCheck):
             ret.append((match.start(), match.end(), match.group()))
         return ret
 
+
 class PythonFormatCheck(BaseFormatCheck):
     '''
     Check for Python format string