test(igxOverlay): fix failing test, #2486

Author: wnvko

projects/igniteui-angular/src/lib/services/overlay/utilities.ts

@@ -62,9 +62,11 @@ export function getPointFromPositionsSettings(settings: PositionSettings, overla
     //  if for some reason overlayWrapper is not at 0,0 position, e.g. overlay is in outlet
     //  which is in element with transform,perspective or filter set, we should translate the result
     //  accordingly
-    const overlayWrapperPosition = overlayWrapper.getBoundingClientRect();
-    result.x -= overlayWrapperPosition.left;
-    result.y -= overlayWrapperPosition.top;
+    if (overlayWrapper) {
+        const overlayWrapperPosition = overlayWrapper.getBoundingClientRect();
+        result.x -= overlayWrapperPosition.left;
+        result.y -= overlayWrapperPosition.top;
+    }
 
     return result;
 }