Don't let a missing markers.js or region.js foul up everything

Fixes #330

web_assets/functions.js

@@ -211,6 +211,7 @@ function drawMapControls() {
 // parse the data as definned in the regions.js
 function initRegions() {
     if (regionsInit) { return; }
+    if (typeof(regionData) == "undefined") { return; } // skip this if we have no region.js file
     regionsInit = true;
     
     for (i in regionGroups) {
@@ -295,6 +296,7 @@ function initRegions() {
 // may need to be reviewed by agrif or someone else... little finicky right now.
 function initMarkers() {
     if (markersInit) { return; } // oh, we've already done this? nevermind, exit the function.
+    if (typeof(markerData) == "undefined") { return; } // no markers.js file, so skip this.
     markersInit = true; // now that we've started, dont have to do it twice.
     
     // first, give all collections an empty array to work with