Fix gRPCid out when registering empty messages #594

Job	Run time
build_windows_x86 / build	18m 11s
build_windows_x64 / build	19m 15s
build_linux / build	8m 26s
build_linux_rt / NILRT Cross Compile with GCC 6.3.0	8m 59s
build_release_arifacts / Download and Build artifacts	23m 53s
	1h 18m 44s

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