upstream: fix panic in isChannel
Fixes the following: goroutine 4380762 [running]: runtime/debug.Stack() runtime/debug/stack.go:24 +0x65 git.sr.ht/~emersion/soju.(*Server)addUserLocked.func1.1() git.sr.ht/~emersion/soju/server.go:318 +0x66 panic({0x563f090c4460, 0xc002bff998}) runtime/panic.go:1038 +0x215 git.sr.ht/~emersion/soju.(*upstreamConn).isChannel(...) git.sr.ht/~emersion/soju/upstream.go:288 git.sr.ht/~emersion/soju.(*downstreamConn).handleMessageRegistered(0xc00c23a000, {0x563f0910eb20, 0xc0027539e0}, 0xc01b8d6240) git.sr.ht/~emersion/soju/downstream.go:1836 +0xd4ec git.s.ht/~emersion/soju.(*downstreamConn).handleMessage(0xc00c3a000, {0x563f0910eae8, 0xc000026058}, 0xc01b8d6240) git.sr.ht/~emersion/soju/downstream.go:697 +0xde git.sr.ht/~emersion/soju.(*user).run(0xc00be4a0b0) git.sr.ht/~emersion/soju/user.go:675 +0xbe5 git.sr.ht/~emersion/soju.(*Server).addUserLocked.func1() git.sr.ht/~emersion/soju/server.go:328 +0x70
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@ -290,7 +290,7 @@ func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
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}
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func (uc *upstreamConn) isChannel(entity string) bool {
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return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
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return len(entity) > 0 && strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
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}
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func (uc *upstreamConn) isOurNick(nick string) bool {
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