fix return value in wizard

xsocs/gui/widgets/Wizard.py

@@ -111,7 +111,7 @@ class LoadXsocsDataPage(_BaseWizardPage):
             Qt.QMessageBox.critical(self,
                                     'Failed to open project file.',
                                     str(ex))
-            return
+            return False
 
         try:
             projectH5.xsocsFile = xsocsFile
@@ -119,7 +119,7 @@ class LoadXsocsDataPage(_BaseWizardPage):
             Qt.QMessageBox.critical(self,
                                     'Failed to set data file.',
                                     str(ex))
-            return
+            return False
         self.setCommitPage(True)
         return True