Merge pull request #6537 from ales-erjavec/fixes/owpredictions-no-target-report

[FIX] owpredictions: Fix a type error in report when using NoopDelegate

Author: janezd

Orange/widgets/evaluate/owpredictions.py

@@ -9,7 +9,7 @@
 import numpy
 from AnyQt.QtWidgets import (
     QTableView, QSplitter, QToolTip, QStyle, QApplication, QSizePolicy,
-    QPushButton, QAbstractItemDelegate)
+    QPushButton, QStyledItemDelegate)
 from AnyQt.QtGui import QPainter, QStandardItem, QPen, QColor, QBrush
 from AnyQt.QtCore import (
     Qt, QSize, QRect, QRectF, QPoint, QPointF, QLocale,
@@ -1117,14 +1117,16 @@ def sizeHint(cls, option, index):
         return cls.__size_hint
 
 
-class NoopItemDelegate(QAbstractItemDelegate):
+class NoopItemDelegate(QStyledItemDelegate):
     def paint(self, *_):
         pass
 
-    @staticmethod
-    def sizeHint(*_):
+    def sizeHint(self, *_):
         return QSize(0, 0)
 
+    def displayText(self, *_):
+        return ""
+
 
 class ClassificationErrorDelegate(ErrorDelegate):
     def displayText(self, value, _):

Orange/widgets/evaluate/tests/test_owpredictions.py

@@ -152,6 +152,14 @@ def test_no_class_on_test(self):
             predmodel.data(predmodel.index(0, 0), Qt.UserRole)))
         self.assertIn(predmodel.data(predmodel.index(0, 0))[0],
                       titanic.domain.class_var.values)
+        self.widget.send_report()
+
+        housing = self.housing[::5]
+        mean_housing = ConstantLearner()(housing)
+        no_target = housing.transform(Domain(housing.domain.attributes, None))
+        self.send_signal(self.widget.Inputs.data, no_target)
+        self.send_signal(self.widget.Inputs.predictors, mean_housing, 1)
+        self.widget.send_report()
 
     def test_invalid_regression_target(self):
         widget = self.widget