Fix interface issue when value is set but no validation tag exists

validator.go

@@ -610,7 +610,7 @@ func (v *Validate) fieldWithNameAndValue(val interface{}, current interface{}, f
 	var valueField reflect.Value
 
 	// This is a double check if coming from validate.Struct but need to be here in case function is called directly
-	if tag == noValidationTag {
+	if tag == noValidationTag || tag == "" {
 		return nil
 	}
 

validator_test.go

@@ -606,6 +606,19 @@ func TestInterfaceErrValidation(t *testing.T) {
 	Equal(t, err.IsPlaceholderErr, false)
 	Equal(t, err.IsSliceOrArray, false)
 	Equal(t, len(err.SliceOrArrayErrs), 0)
+
+	type MyStruct struct {
+		A, B string
+		C    interface{}
+	}
+
+	var a MyStruct
+
+	a.A = "value"
+	a.C = "nu"
+
+	errs = validate.Struct(a)
+	Equal(t, errs, nil)
 }
 
 func TestMapDiveValidation(t *testing.T) {