fix(geo): check for undefined in isEqual

packages/react-instantsearch-dom-maps/src/Connector.js

@@ -8,13 +8,22 @@ function isEqualPosition(a, b) {
   if (a === b) {
     return true;
   }
+  if (a === undefined || b === undefined) {
+    return false;
+  }
+
   return a.lat === b.lat && a.lng === b.lng;
 }
 
 function isEqualCurrentRefinement(a, b) {
   if (a === b) {
     return true;
   }
+
+  if (a === undefined || b === undefined) {
+    return false;
+  }
+
   return (
     isEqualPosition(a.northEast, b.northEast) &&
     isEqualPosition(a.southWest, b.southWest)