invalid gene mapping caused problems in frontend

Closes #1557 (closed)

frontend-js/src/main/js/map/window/AliasInfoWindow.js

@@ -297,7 +297,7 @@ AliasInfoWindow.prototype.createChartDiv = function (params) {
         result.appendChild(rows[i][j]);
       }
     }
-    result.appendChild( document.createElement("br"));
+    result.appendChild(document.createElement("br"));
     return result;
   });
 };
@@ -457,13 +457,17 @@ AliasInfoWindow.prototype.createGenomicDiv = function (params) {
       });
       for (var k = 0; k < genome.getGeneMappings().length; k++) {
         var mapping = genome.getGeneMappings()[k];
-        pileupSource.push({
-          viz: pileup.viz.genes(),
-          data: pileup.formats.bigBed({
-            url: mapping.getUrl()
-          }),
-          name: 'Genes ' + mapping.getName()
-        });
+        if (mapping.getUrl() === null || mapping.getUrl() === undefined) {
+          logger.warn("No url for gene mapping " + mapping.getName());
+        } else {
+          pileupSource.push({
+            viz: pileup.viz.genes(),
+            data: pileup.formats.bigBed({
+              url: mapping.getUrl()
+            }),
+            name: 'Genes ' + mapping.getName()
+          });
+        }
       }
     }
     for (i = 0; i < overlaysData.length; i++) {
@@ -556,7 +560,7 @@ AliasInfoWindow.prototype.createGenomicDiv = function (params) {
         zoomOut.appendTo(zoomControls);
       }
 
-      result.appendChild( document.createElement("br"));
+      result.appendChild(document.createElement("br"));
       return result;
     } else {
       return document.createElement("div");