fix(angular): mark radio group as touched when radio is blurred

Author: brandyscarney

packages/angular/common/src/directives/control-value-accessors/value-accessor.ts

@@ -52,6 +52,13 @@ export class ValueAccessor implements ControlValueAccessor, AfterViewInit, OnDes
     if (el === this.elementRef.nativeElement) {
       this.onTouched();
       setIonicClasses(this.elementRef);
+
+    // When ion-radio is blurred, el and this.elementRef.nativeElement are
+    // different so we need to check if the closest ion-radio-group is the same
+    // as this.elementRef.nativeElement and if so, we need to mark the radio group
+    // as touched
+    } else if (el.closest('ion-radio-group') === this.elementRef.nativeElement) {
+      this.onTouched();
     }
   }