fix: handle null close code and reason in WebSocketRoute #2838

Job	Run time
stable (ubuntu-latest, chrome)	7m 17s
stable (windows-latest, msedge)	18m 9s
stable (macos-latest, chrome)	25m 32s
dev (windows-latest, webkit)	14m 31s
dev (macos-latest, chromium)	9m 19s
dev (windows-latest, chromium)	11m 45s
dev (ubuntu-latest, firefox)	11m 58s
dev (macos-latest, webkit)	9m 30s
dev (macos-latest, firefox)	14m 54s
stable (windows-latest, chrome)	15m 46s
dev (ubuntu-latest, chromium)	7m 4s
stable (macos-latest, msedge)	24m 17s
dev (windows-latest, firefox)	18m 13s
Java_21 (firefox)	11m 24s
Java_21 (chromium)	6m 6s
Java_21 (webkit)	8m 44s
dev (ubuntu-latest, webkit)	9m 3s
	3h 43m 32s

Provide feedback