fix: inbox throws if session is not available

Author: gyoshev

src/LeanplumInbox.ts

@@ -98,7 +98,11 @@ export default class LeanplumInbox implements Inbox {
       Constants.DEFAULT_KEYS.INBOX_MESSAGES,
       'session'
     )
-    this.messageMap = JSON.parse(state) || {}
+    try {
+      this.messageMap = JSON.parse(state) || {}
+    } catch (e) {
+      this.messageMap = {}
+    }
   }
 
   public count(): number {

test/specs/LeanplumInbox.test.ts

@@ -437,6 +437,14 @@ describe(LeanplumInbox, () => {
 
       expect(inbox.allMessages().length).toEqual(1)
     })
+
+    it('does not expect messages in session', () => {
+      sessionStorage.setItem('__leanplum_inbox_messages', '')
+
+      inbox = new LeanplumInbox(createRequestSpy, onActionSpy)
+
+      expect(inbox.allMessages().length).toEqual(0)
+    })
   })
 
   function mockMessages(newsfeedMessages: any): void {