notification fix and date selectable (frappe/erpnext#6423) (frappe/erpnext#6389) (#2088)

* [ui][fix] disable notification when 0

* [enhance] other month dates selectable

frappe/public/js/frappe/form/control.js

@@ -605,6 +605,8 @@ frappe.ui.form.ControlDate = frappe.ui.form.ControlData.extend({
 		changeYear: true,
 		changeMonth: true,
 		yearRange: "-70Y:+10Y",
+		showOtherMonths: true,
+		selectOtherMonths: true
 	},
 	make_input: function() {
 		this._super();

frappe/public/js/frappe/ui/toolbar/notifications.js

@@ -46,10 +46,11 @@ frappe.ui.notifications.update_notifications = function() {
 		}
 	});
 
-	// switch colour on the navbar
+	// switch colour on the navbar and disable if no notifications
 	$(".navbar-new-comments")
 		.html(frappe.ui.notifications.total > 20 ? '20+' : frappe.ui.notifications.total)
-		.toggleClass("navbar-new-comments-true", frappe.ui.notifications.total ? true : false);
+		.toggleClass("navbar-new-comments-true", frappe.ui.notifications.total ? true : false)
+		.parent().toggleClass("disabled", frappe.ui.notifications.total ? false : true);
 
 }