Hide settings visibility row if it is not in preferences

CURA-4344

Hide the row which shows the number of settings that are visible on the
project file loading dialog if this information is not available.

plugins/3MFReader/ThreeMFWorkspaceReader.py

@@ -302,12 +302,14 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                         break
 
         num_visible_settings = 0
+        has_visible_settings_string = False
         try:
             temp_preferences = Preferences()
             serialized = archive.open("Cura/preferences.cfg").read().decode("utf-8")
             temp_preferences.deserialize(serialized)
 
             visible_settings_string = temp_preferences.getValue("general/visible_settings")
+            has_visible_settings_string = visible_settings_string is not None
             if visible_settings_string is not None:
                 num_visible_settings = len(visible_settings_string.split(";"))
             active_mode = temp_preferences.getValue("cura/active_mode")
@@ -334,6 +336,7 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
         self._dialog.setQualityChangesConflict(quality_changes_conflict)
         self._dialog.setDefinitionChangesConflict(definition_changes_conflict)
         self._dialog.setMaterialConflict(material_conflict)
+        self._dialog.setHasVisibleSettingsField(has_visible_settings_string)
         self._dialog.setNumVisibleSettings(num_visible_settings)
         self._dialog.setQualityName(quality_name)
         self._dialog.setQualityType(quality_type)

plugins/3MFReader/WorkspaceDialog.py

@@ -38,6 +38,7 @@ class WorkspaceDialog(QObject):
         self._has_definition_changes_conflict = False
         self._has_machine_conflict = False
         self._has_material_conflict = False
+        self._has_visible_settings_field = False
         self._num_visible_settings = 0
         self._num_user_settings = 0
         self._active_mode = ""
@@ -58,6 +59,7 @@ class WorkspaceDialog(QObject):
     numVisibleSettingsChanged = pyqtSignal()
     activeModeChanged = pyqtSignal()
     qualityNameChanged = pyqtSignal()
+    hasVisibleSettingsFieldChanged = pyqtSignal()
     numSettingsOverridenByQualityChangesChanged = pyqtSignal()
     qualityTypeChanged = pyqtSignal()
     machineNameChanged = pyqtSignal()
@@ -167,6 +169,14 @@ class WorkspaceDialog(QObject):
             self._active_mode = i18n_catalog.i18nc("@title:tab", "Custom")
         self.activeModeChanged.emit()
 
+    @pyqtProperty(int, notify = hasVisibleSettingsFieldChanged)
+    def hasVisibleSettingsField(self):
+        return self._has_visible_settings_field
+
+    def setHasVisibleSettingsField(self, has_visible_settings_field):
+        self._has_visible_settings_field = has_visible_settings_field
+        self.hasVisibleSettingsFieldChanged.emit()
+
     @pyqtProperty(int, constant = True)
     def totalNumberOfSettings(self):
         return len(ContainerRegistry.getInstance().findDefinitionContainers(id="fdmprinter")[0].getAllKeys())

plugins/3MFReader/WorkspaceDialog.qml

@@ -331,6 +331,7 @@ UM.Dialog
             {
                 width: parent.width
                 height: childrenRect.height
+                visible: manager.hasVisibleSettingsField
                 Label
                 {
                     text: catalog.i18nc("@action:label", "Visible settings:")