maps: Catch unloaded data

If a single geojson file is uploaded this will prevent errors and return an console log that one of the files could not be loaded. This is less elegant than switching which layers to create but that route has added complexity. A good future improvement

cove_ofds/templates/cove_ofds/explore.html

@@ -380,9 +380,7 @@ <h4 class="panel-title">
       }
 
       function getJsonFromDict(feature) {
-        console.log(feature.geometry.type)
         if (feature.geometry.type === 'Point') {
-          console.log('node', document.getElementById('node-fields').textContent)
           return JSON.parse(document.getElementById('node-fields').textContent);
         } else if (feature.geometry.type === 'LineString') {
           return JSON.parse(document.getElementById('span-fields').textContent);
@@ -439,6 +437,9 @@ <h4 class="panel-title">
           spanLayerGroup.addLayer(layer)
           map.fitBounds(layer.getBounds())
           return generateLegendItems(spanFeatureData)
+        }).catch(err => {
+          console.log("The Spans data could not be loaded.");
+          return [];
         })
       }
 
@@ -455,7 +456,11 @@ <h4 class="panel-title">
             }
           }).bindPopup(layer => generatePopup(layer), customOptions)
           nodeLayerGroup.addLayer(layer)
+          map.fitBounds(layer.getBounds())
           return generateLegendItems(nodeFeatureData)
+        }).catch(err => {
+          console.log("The Nodes data could not be loaded.")
+          return [];
         })
       }