Update empty word check (#8572)

packages/devtools_app/lib/src/screens/debugger/codeview.dart

diff --git a/packages/devtools_app/lib/src/screens/debugger/codeview.dart b/packages/devtools_app/lib/src/screens/debugger/codeview.dart
index 0a92550..64ebb7f 100644
--- a/packages/devtools_app/lib/src/screens/debugger/codeview.dart
+++ b/packages/devtools_app/lib/src/screens/debugger/codeview.dart
@@ -1172,7 +1172,7 @@
 
     final word = wordForHover(event.localPosition.dx, widget.lineContents);
 
-    if (word != '' && !isPrimitiveValueOrNull(word)) {
+    if (word.isNotEmpty && !isPrimitiveValueOrNull(word)) {
       try {
         final response = await evalService.evalAtCurrentFrame(word);
         final isolateRef =