navigation bar should be enabled when we are in plot mode

Bug was, that the navigation bar was disabled when no results were
found.

pdb-ui/src/main/resources/resources/js/ui.js

@@ -285,7 +285,7 @@ Vue.component('navigation-bar-dashboard', {
 	},
 	computed: {
 		navigationVisible: function() {
-			return data.dashboard.tiles.length > 0;
+			return data.mode == 'dashboard';
 		},
 		showProgressBar: function(){
 			return data.dashboard.toBeRendered.length > 0;
@@ -502,10 +502,10 @@ Vue.component('navigation-bar', {
 	},
 	computed: {
 		navigationDisabled: function() {
-			return !data.resultView.imageUrl;
+			return data.mode != 'plot';
 		},
 		navigationVisible: function() {
-			return data.dashboard.tiles.length == 0;
+			return data.mode != 'dashboard';
 		}
 	},
 	template: `
@@ -538,6 +538,7 @@ Vue.component('search-bar', {
   methods: {
     plot: function (event) {
     	var vm = this;
+    	data.mode = 'plot';
 		if (this.searchBar.splitByKeys.selected){
 			this.splitQueries(function (fieldValues) {
 				data.searchBar.splitBy['values'] = fieldValues;
@@ -551,6 +552,7 @@ Vue.component('search-bar', {
 		}
     },
     createNewDashboard: function (event) {
+    	data.mode = 'dashboard';
     	createDashboard(this);
     },
     enableSplitBy: function(fieldValues) {
@@ -760,6 +762,7 @@ initInvaders('result');
 
 var data = {
 
+	mode: '', // 'plot' or 'dashboard', depending on what is currently active. Initially empty. 
 	searchBar: {
 		query: GetURLParameter('query', 'pod=vapfinra01 and method = ViewService.findFieldViewGroup'),
 		proposals: [],