MappointAid Error Radius Check closes #1487 (#1516)

# Issue #1487
# Summary
Added check for error radius input to error radius. If it doesn't exist
default to 0 so no circle is drawn nor value sent outbound.

collections/tools/mappointaid.php

@@ -142,7 +142,8 @@ function moveCircle(c, pos) {
 
 			function createMarker(lat, lng)  {
 				drawnItems.clearLayers();
-				errRadius = parseFloat(document.getElementById("errRadius").value);
+				const errorRadInput = document.getElementById("errRadius");
+				errRadius = errorRadInput? parseFloat(errorRadInput.value): 0;
 
 				latlng = [lat,lng];