[processing] Fix exception when parameters are missing in batch dialog

nyalldawson · nyalldawson · commit 9ead36db48da · 2018-02-27T11:03:13.000+10:00
Refs #18236 (cherry-picked from 6e44a27)
diff --git a/python/plugins/processing/gui/BatchPanel.py b/python/plugins/processing/gui/BatchPanel.py
@@ -193,7 +193,7 @@ def save(self):
                     continue
                 wrapper = self.wrappers[row][col]
                 if not param.checkValueIsAcceptable(wrapper.value(), context):
-                    self.parent.bar.pushMessage("", self.tr('Wrong or missing parameter value: {0} (row {1})').format(
+                    self.parent.messageBar().pushMessage("", self.tr('Wrong or missing parameter value: {0} (row {1})').format(
                         param.description(), row + 1),
                         level=Qgis.Warning, duration=5)
                     return
@@ -208,7 +208,7 @@ def save(self):
                     algOutputs[out.name()] = text.strip()
                     col += 1
                 else:
-                    self.parent.bar.pushMessage("", self.tr('Wrong or missing output value: {0} (row {1})').format(
+                    self.parent.messageBar().pushMessage("", self.tr('Wrong or missing output value: {0} (row {1})').format(
                         out.description(), row + 1),
                         level=Qgis.Warning, duration=5)
                     return
