fix 500 on reverse via search without result

e.g. /search?q=1,1

website/search.php

@@ -1266,8 +1266,10 @@
 			if (isset($_GET['nearlat']) && trim($_GET['nearlat'])!=='' && isset($_GET['nearlon']) && trim($_GET['nearlon']) !== '')
 			{
 				$iPlaceID = geocodeReverse($_GET['nearlat'], $_GET['nearlon']);
-				$aResultPlaceIDs = array($iPlaceID);
 
+				if ($iPlaceID)
+				{
+					$aResultPlaceIDs = array($iPlaceID);
 					// TODO: this needs refactoring!
 
 					// Get the details for display (is this a redundant extra step?)
@@ -1334,6 +1336,11 @@
 						failInternalError("Could not get details for place (near).", $sSQL, $aSearchResults);
 					}
 				}
+				else
+				{
+					$aSearchResults = array();
+				}
+			}
 		}
 	}