fix(core): fix nullable control in the config state

npm/ng-packs/packages/core/src/lib/states/config.state.ts

@@ -137,6 +137,7 @@ export class ConfigState {
     key: string | Config.LocalizationWithDefault,
     ...interpolateParams: string[]
   ) {
+    if (!key) key = '';
     let defaultValue: string;
 
     if (typeof key !== 'string') {
@@ -144,8 +145,6 @@ export class ConfigState {
       key = key.key;
     }
 
-    if (!key) key = '';
-
     const keys = key.split('::') as string[];
     const selector = createSelector([ConfigState], (state: Config.State) => {
       if (!state.localization) return defaultValue || key;