Display warning for missing regexes

data/templates/fry/config.yml

@@ -7,5 +7,5 @@ aliases:
 - futurama-fry
 - not-sure-if
 regexes:
-- (not sure if .+)/?(or .+)
+- (not sure .+)/?(or .+)
 - (.+ if .+)/?(or .+)

data/templates/sb/config.yml

@@ -5,3 +5,4 @@ default:
 link: http://knowyourmeme.com/memes/scumbag-brain
 aliases:
 - scumbag-brain
+regexes: []

memegen/domain/template.py

@@ -184,13 +184,18 @@ def validate_size(self):
         return True
 
     def validate_regexes(self):
+        if not self.regexes:
+            self._warn("no regexes")
         for regex in self.regexes:
             pattern = regex.pattern
             if ")/?(" not in pattern:
                 self._error("regex missing separator: %r", pattern)
                 return False
         return True
 
+    def _warn(self, fmt, *objects):
+        log.warning("Template '%s' " + fmt, self, *objects)
+
     def _error(self, fmt, *objects):
         log.error("Template '%s' " + fmt, self, *objects)