fix(popover): hide arrow if no event was passed

closes #6796

src/components/popover/popover.ts

@@ -339,6 +339,11 @@ class PopoverTransition extends Transition {
     var arrowWidth = arrowDim.width;
     var arrowHeight = arrowDim.height;
 
+    // If no ev was passed, hide the arrow
+    if (!targetDim) {
+      arrowEle.style.display = 'none';
+    }
+
     let arrowCSS = {
       top: targetTop + targetHeight,
       left: targetLeft + (targetWidth / 2) - (arrowWidth / 2)