Deal with initially having no work items

mobile/src/util.js

@@ -67,12 +67,12 @@ export const dotify = (s) => {
 }
 
 export const regionContainingPoints = (points, inset) => {
-  let minX,
-    maxX,
-    minY,
-    maxY
+  let minX, maxX, minY, maxY
+
+  if (!points) {
+    return null
+  }
 
-    // init first point
   ;((point) => {
     minX = point.latitude
     maxX = point.latitude
@@ -80,7 +80,6 @@ export const regionContainingPoints = (points, inset) => {
     maxY = point.longitude
   })(points[0])
 
-  // calculate rect
   points.map((point) => {
     minX = Math.min(minX, point.latitude)
     maxX = Math.max(maxX, point.latitude)