Silence "complete" output in deactivate script

[klauer]

When nesting a bash shell in an activated conda environment that includes happi, this deactivate line can cause unwanted warnings to be displayed in the terminal:

happi/conda-recipe/deactivate.sh

Line 4 in 8db471e

[ -n "$BASH" ] && complete -r happi

Reference issue: pcdshub/shared-dotfiles#36

Redirecting to /dev/null should be sufficient.

The conda-forge feedstock will need updating as well:
https://github.com/conda-forge/happi-feedstock/

[klauer]

I see this on ads-deploy via plcprog-console as well, frustratingly enough when building PLC projects:

/C/miniconda/envs/ads-deploy-2.9.1/etc/conda/deactivate.d/happi.sh: line 4: complete: happi: no completion specification