fix(table-color): allow undefined type for color input prop

Author: xidedix

projects/coreui-angular/src/lib/table/table-color.directive.ts

@@ -13,11 +13,12 @@ export class TableColorDirective {
    * Use contextual color for tables, table rows or individual cells.
    * @return Colors
    */
-  readonly color = input<Colors>(undefined, { alias: 'cTableColor' });
+  readonly color = input<Colors | undefined>(undefined, { alias: 'cTableColor' });
 
   readonly hostClasses = computed(() => {
+    const color = this.color();
     return {
-      [`table-${this.color()}`]: !!this.color()
+      [`table-${color}`]: !!color
     } as Record<string, boolean>;
   });
 }