fix(lib): type safety in symbol autocomplete

libs/common/src/lib/interfaces/lookup-item.interface.ts

@@ -7,7 +7,7 @@ export interface LookupItem {
   assetSubClass: AssetSubClass;
   currency: string;
   dataProviderInfo: DataProviderInfo;
-  dataSource: DataSource;
+  dataSource: DataSource | null;
   name: string;
   symbol: string;
 }

libs/ui/src/lib/symbol-autocomplete/symbol-autocomplete.component.ts

@@ -185,7 +185,7 @@ export class GfSymbolAutocompleteComponent
   public ngDoCheck() {
     if (this.ngControl) {
       this.validateRequired();
-      this.errorState = this.ngControl.invalid && this.ngControl.touched;
+      this.errorState = !!(this.ngControl.invalid && this.ngControl.touched);
       this.stateChanges.next();
     }
   }
@@ -225,7 +225,7 @@ export class GfSymbolAutocompleteComponent
       ? !super.value?.dataSource || !super.value?.symbol
       : false;
     if (requiredCheck) {
-      this.ngControl.control.setErrors({ invalidData: true });
+      this.ngControl.control?.setErrors({ invalidData: true });
     }
   }
 }