UI: added default value to colorSettings type and default case for colorProcessor

ui-ngx/src/app/modules/home/components/widget/lib/settings/common/color-settings-panel.component.ts

@@ -65,7 +65,7 @@ export class ColorSettingsPanelComponent extends PageComponent implements OnInit
   ngOnInit(): void {
     this.colorSettingsFormGroup = this.fb.group(
       {
-        type: [this.colorSettings?.type, []],
+        type: [this.colorSettings?.type || ColorType.constant, []],
         color: [this.colorSettings?.color, []],
         rangeList: [this.colorSettings?.rangeList, []],
         colorFunction: [this.colorSettings?.colorFunction, []]

ui-ngx/src/app/shared/models/widget-settings.models.ts

@@ -161,6 +161,8 @@ export abstract class ColorProcessor {
         return new RangeColorProcessor(settings);
       case ColorType.function:
         return new FunctionColorProcessor(settings);
+      default:
+        return new ConstantColorProcessor(settings);
     }
   }