fix: crash when copying/moving all messages

This prevents dereferencing nil when updating RUE counts. This seems to
happen for messages that were not yet loaded, but were selected for
copy operation. This can happen when using `mark -a` command and then
initiating copy operation.

When such message is encountered during RUE counting, it is stopped
and full recount is triggered.

**Original backtrace:**
Error: runtime error: invalid memory address or nil pointer dereference

goroutine 1 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:24 +0x65
git.sr.ht/~rjarry/aerc/logging.PanicHandler()
	git.sr.ht/~rjarry/aerc/logging/panic-logger.go:45 +0x64b
panic({0x9e5f80, 0xecc360})
	runtime/panic.go:844 +0x258
git.sr.ht/~rjarry/aerc/widgets.(*AccountView).onMessage(0xc0001be870, {0xb7f860?, 0xc00073b4c0?})
	git.sr.ht/~rjarry/aerc/widgets/account.go:353 +0xecc
git.sr.ht/~rjarry/aerc/widgets.(*AccountView).Tick(0xc0001be870)
	git.sr.ht/~rjarry/aerc/widgets/account.go:116 +0x6c
git.sr.ht/~rjarry/aerc/widgets.(*Aerc).Tick(0xc0003ba000)
	git.sr.ht/~rjarry/aerc/widgets/aerc.go:144 +0x7a
main.main()
	git.sr.ht/~rjarry/aerc/aerc.go:225 +0xbb8

Signed-off-by: Ensar Sarajčić <dev@ensarsarajcic.com>
Acked-by: Robin Jarry <robin@jarry.cc>

0 files changed, 0 insertions, 0 deletions