Some "invalid option" fixes:

- Don't notify user, just log it to the console
- Fix calendar owner filtered out not loaded options

api/js/etemplate/Et2Select/Et2Select.ts

@@ -530,7 +530,7 @@ export class Et2Select extends Et2WithSearchMixin(Et2WidgetWithSelect)
 			const missing = value.filter(v => !this.select_options.some(option => option.value == v));
 			if(missing.length > 0)
 			{
-				this.helpText = this.egw().lang("Invalid option '%1' removed", missing.join(", "));
+				console.warn("Invalid option '" + missing.join(", ") + " ' removed");
 				value = value.filter(item => missing.indexOf(item) == -1);
 			}
 		}

calendar/js/CalendarOwner.ts

@@ -96,6 +96,19 @@ export class CalendarOwner extends Et2Select
 		});
 	}
 
+	/**
+	 * Check a value for missing options and remove them.
+	 *
+	 * Override to allow any value, since we won't have all options
+	 *
+	 * @param {string[]} value
+	 * @returns {string[]}
+	 */
+	filterOutMissingOptions(value : string[]) : string[]
+	{
+		return value;
+	}
+
 	/**
 	 * Override icon for the select option to use lavatar
 	 *