refreshVideoContainer() fails when there is no remote views

Hi there, first of all, many thanks for the great work! I really appreciate it.

I'm currently trying to build a local test app with just my own camera enabled (the local video feed). But the app would crash in PhoneRTCPlugin.swift on line 260, where it says:
`let n = self.remoteVideoViews.count`
`if n == 0 {
return
}`

The runtime error is Bad Access. Any idea how I can fix this? Supposedly the "n" would be 0, and this function would return later, but it never got that far.

Any insight would be greatly appreciated!

**UPDATE**: I just tested the provided demo clients & server. The server worked well, and the clients can see each other. however, when attempting to make a call, both clients would crash immediately due to the issue mentioned above. So, it appears that the app would crash whenever the local feed is being activated without the remote feed.