🎨 dashlet-badge.js : restore leading semicolon

See added info in js/README.md on reason why this semicolon has to be there

js/README.md

@@ -1,5 +1,29 @@
+# JS for iTop
+
+## File location
+
 In order to better separate our developments from the embedded third-party libs, files should be moved in either the /components or /lib folders.
 
-IMPORTANT: Before moving a file, we should first consider if: 
+IMPORTANT: Before moving a file, we should first consider if:
+
 - The file is used in an iTop extension that should be compatible with the iTop version currently under developments
-- The file is still used in iTop itself (or if we can consider removing it for clean up)
+- The file is still used in iTop itself (or if we can consider removing it for clean up)
+
+## Leading semicolon
+
+When concataining 2 files with code execution, we might have a prb.
+
+For example :
+
+```
+// file A
+(A)()
+// file B
+(B)()
+```
+
+Having `(A)()(B)()` is different than `(A)();(B)();` !
+
+To avoid those problems simply add a leading semicolon on all JS files containing `()` at their end.
+
+See https://stackoverflow.com/a/23056287

js/components/dashlet/dashlet-badge.js

@@ -16,6 +16,7 @@
  * You should have received a copy of the GNU Affero General Public License
  */
 
+;
 $(function () {
 	$.widget('itop.dashlet_badge',
 		{