fix[tagsView]: fixed DEL_OTHERS_CACHED_VIEWS bug

Author: PanJiaChen

src/store/modules/tagsView.js

@@ -39,7 +39,12 @@ const mutations = {
   },
   DEL_OTHERS_CACHED_VIEWS: (state, view) => {
     const index = state.cachedViews.indexOf(view.name)
-    index > -1 && (state.cachedViews = state.cachedViews.slice(index, index + 1))
+    if (index > -1) {
+      state.cachedViews = state.cachedViews.slice(index, index + 1)
+    } else {
+      // if index = -1, there is no cached tags
+      state.cachedViews = []
+    }
   },
 
   DEL_ALL_VISITED_VIEWS: state => {