Check whether state store is connected when prompting to save files

src/state-store.js

@@ -10,10 +10,12 @@ class StateStore {
         db.createObjectStore('states')
       }
       dbOpenRequest.onsuccess = () => {
+        this.isConnected = true
         resolve(dbOpenRequest.result)
       }
       dbOpenRequest.onerror = (error) => {
         console.error('Could not connect to indexedDB', error)
+        this.isConnected = false
         resolve(null)
       }
     })

src/text-editor.coffee

@@ -892,7 +892,7 @@ class TextEditor extends Model
   # Determine whether the user should be prompted to save before closing
   # this editor.
   shouldPromptToSave: ({windowCloseRequested, projectHasPaths}={}) ->
-    if windowCloseRequested and projectHasPaths
+    if windowCloseRequested and projectHasPaths and atom.stateStore.isConnected
       false
     else
       @isModified() and not @buffer.hasMultipleEditors()