[processing] correctly set default value for string parameters when no value is provided

volaya · volaya · commit d7bd5dc50705 · 2016-10-18T17:41:59.000+02:00
diff --git a/python/plugins/processing/core/parameters.py b/python/plugins/processing/core/parameters.py
@@ -740,7 +740,7 @@ class ParameterString(Parameter):
     NEWLINE = '\n'
     ESCAPED_NEWLINE = '\\n'
 
-    def __init__(self, name='', description='', default=None, multiline=False,
+    def __init__(self, name='', description='', default='', multiline=False,
                  optional=False, evaluateExpressions=False):
         Parameter.__init__(self, name, description, default, optional)
         self.multiline = parseBool(multiline)
@@ -750,7 +750,7 @@ def setValue(self, obj):
         if not bool(obj):
             if not self.optional:
                 return False
-            self.value = None
+            self.value = self.default
             return True
 
         self.value = unicode(obj).replace(
