[processing] correct check for empty extent values. MAde extent params optional by default, to accept auto extent

volaya · volaya · commit 8de56bf01a38 · 2016-10-21T09:37:46.000+02:00
diff --git a/python/plugins/processing/core/parameters.py b/python/plugins/processing/core/parameters.py
@@ -193,12 +193,12 @@ class ParameterExtent(Parameter):
 
     USE_MIN_COVERING_EXTENT = 'USE_MIN_COVERING_EXTENT'
 
-    def __init__(self, name='', description='', default=None, optional=False):
+    def __init__(self, name='', description='', default=None, optional=True):
         Parameter.__init__(self, name, description, default, optional)
         # The value is a string in the form "xmin, xmax, ymin, ymax"
 
     def setValue(self, text):
-        if text is None:
+        if not text:
             if not self.optional:
                 return False
             self.value = None
