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[processing] Fix warning when loading algorithm dialog and no layers

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are present

Fixes #21631
This commit is contained in:
Nyall Dawson 2019-03-21 09:24:11 +10:00
parent db75122089
commit c66159bd2d
1 changed files with 9 additions and 6 deletions
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15
python/plugins/processing/gui/wrappers.py
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@ -1630,12 +1630,15 @@ class TableFieldWidgetWrapper(WidgetWrapper):
if isinstance(layer, QgsProcessingFeatureSourceDefinition):
layer, ok = layer.source.valueAsString(self.context.expressionContext())
if isinstance(layer, str):
layer = QgsProcessingUtils.mapLayerFromString(layer, self.context)
if not isinstance(layer, QgsVectorLayer) or not layer.isValid():
self.dialog.messageBar().clearWidgets()
self.dialog.messageBar().pushMessage("", self.tr("Could not load selected layer/table. Dependent field could not be populated"),
level=Qgis.Warning, duration=5)
return
if not layer: # empty string
layer = None
else:
layer = QgsProcessingUtils.mapLayerFromString(layer, self.context)
if not isinstance(layer, QgsVectorLayer) or not layer.isValid():
self.dialog.messageBar().clearWidgets()
self.dialog.messageBar().pushMessage("", self.tr("Could not load selected layer/table. Dependent field could not be populated"),
level=Qgis.Warning, duration=5)
return
self._layer = layer