Fix for answering preview widgets

The ambiguity of the greyedOut value and the ways it is passed, caused some problems. There are cases where it is passed through injection by the RccWidgetComponent (which receives it via input by the parent component RccQuestionLaneComponents template. In other cases like with RccSessionRequestPresentOptionsModalComponent it is set conventionally via input.

Error:

Source of the NullInjectorError

RadioSelectBaseComponent has the injected value set to be optional.

But the derived RccRadioSelectComponent overrides that and makes it mandatory:

The RccSessionRequestPresentOptionsModalComponent doesn't receive an injected value by RccWidgetComponent. But since the derived RccRadioSelectComponentis used instead of thebasecomponent, it throws an error for the missing injected value. The default value which was set by thebasecomponent isn't used because of the resultingNullInjectorError`.

what to do

• move all the greyedOut logic out from the base, only leaving the @Input() greyedOut
• differentiate better between the kinds of greyedOut variables, i.e. @Optional() @Inject('greyedOut') injectedGreyedOut: boolean
• add clear to understand condition for greyedOut: if (injectedGreyedOut) this.greyedOut = injectedGreyedOut that states that if there was an (optional) injected greyedOut value passed to use the injected one, otherwise leave the this.greyedOut as is (default = false) or use the value received through @Input()
• check all components where greyedOut is used and assess whether it receives it either both through @Input() as well as @Inject()
• add @Optional() this is the case
• if it only receives the value through @Inject() because that component is always created dynamically, remove the unnecessary @Input()