Fix for #12812

Author: pcav

python/plugins/processing/algs/qgis/scripts/Number_of_unique_values_in_classes.py

@@ -1,13 +1,9 @@
 ##Vector table tools=group
-##Input=vector
-##Class_field=field input
-##Value_field=field input
+##input=vector
+##class_field=field input
+##value_field=field input
 ##N unique values=output vector
 
-from PyQt4.Qt import QVariant
-
-from qgis.core import QgsField, QgsFeature
-
 layer = processing.getObject(input)
 provider = layer.dataProvider()
 fields = provider.fields()