cancelConfirmKeysOnEmpty behaviour was reversed

if cancelConfirmKeysOnEmpty = false (default), then don't cancel confirm keys on empty input

src/bootstrap-tagsinput.js

@@ -479,7 +479,7 @@
             }
 
             // If the field is empty, let the event triggered fire as usual
-            if (self.options.cancelConfirmKeysOnEmpty === false) {
+            if (self.options.cancelConfirmKeysOnEmpty !== false) {
                 event.preventDefault();
             }
          }