feat: send message in channel if no subscription #460

Job	Run time
setup-environment	11s
test-various (combat)	2m 56s
test-scarb-fmt	10s
test-various (buildings)	3m 51s
test-various (config)	2m 43s
test-various (hyperstructure)	2m 50s
test-various (bank)	2m 47s
test-various (map)	2m 44s
test-various (name)	2m 45s
test-various (resources)	2m 55s
test-various (trade)	3m 5s
test-various (realm)	2m 52s
test-various (guild)	2m 45s
test-various (transport)	2m 44s
test-various (models)	3m 5s
	38m 23s

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