Don't serialize server errors to client. (#1126) #1075

Job	Run time
Documentation	1m 24s
Julia 1.6 - ubuntu-latest - x64 - push	4m 40s
Julia 1.6 - macOS-latest - x64 - push	7m 17s
Julia 1 - ubuntu-latest - x64 - push	4m 24s
Julia 1 - macOS-latest - x64 - push	3m 32s
Julia 1 - windows-latest - x64 - push	3m 36s
Julia nightly - ubuntu-latest - x64 - push	5m 5s
Julia nightly - macOS-latest - x64 - push	6m 28s
Julia nightly - windows-latest - x64 - push	4m 40s
Julia 1 - windows-latest - x86 - push	6m 25s
	47m 31s

Provide feedback