Fix video capturer null handling and reset localVideoTrack on teardown#69

DivyanshuChipa wants to merge 1 commit intofeat/video-calling-18390055824140193157DivyanshuChipa/IntraChat-Android-FastAPI:feat/video-calling-18390055824140193157from

codex/fix-high-priority-bugs-from-codex-reviewDivyanshuChipa/IntraChat-Android-FastAPI:codex/fix-high-priority-bugs-from-codex-reviewCopy head branch name to clipboard