fix: handle empty string in data-value attribute correctly

Author: mercuryseries

src/LiveComponent/assets/dist/live_controller.js

@@ -377,7 +377,7 @@ function getValueFromElement(element, valueStore) {
     }
     return element.value;
   }
-  if (element.dataset.value) {
+  if (element.hasAttribute("data-value")) {
     return element.dataset.value;
   }
   if ("value" in element) {

src/LiveComponent/assets/src/dom_utils.ts

@@ -51,7 +51,7 @@ export function getValueFromElement(element: HTMLElement, valueStore: ValueStore
     }
 
     // element is some other element
-    if (element.dataset.value) {
+    if (element.hasAttribute("data-value")) {
         return element.dataset.value;
     }