Exception from funannotate2 install when FUNANNOTATE2_DB not set

[peterjc]

Dependencies installed with conda and funannotate with pip as per full log on #82.

$ funannotate2 install -d merops
[Aug 03 11:51 AM] Python v3.13.14; funannotate2 v26.6.21; gfftk v26.5.22; buscolite v26.6.21; annorefine v2026.2.22
<frozen genericpath>:51: RuntimeWarning: bool is used as a file descriptor
Traceback (most recent call last):
  File "/mnt/apps/users/pcock/conda/envs/funannotate2/bin/funannotate2", line 6, in <module>
    sys.exit(main())
             ~~~~^^
  File "/mnt/apps/users/pcock/conda/envs/funannotate2/lib/python3.13/site-packages/funannotate2/__main__.py", line 22, in main
    install(args)
    ~~~~~~~^^^^^^
  File "/mnt/apps/users/pcock/conda/envs/funannotate2/lib/python3.13/site-packages/funannotate2/install.py", line 47, in install
    os.makedirs(env["FUNANNOTATE2_DB"])
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen os>", line 213, in makedirs
  File "<frozen posixpath>", line 103, in split
TypeError: expected str, bytes or os.PathLike object, not bool

Initially I wondered if this was a Python version problem, but rather in https://github.com/nextgenusfs/funannotate2/blob/main/funannotate2/config.py dictionary entry env["FUNANNOTATE2_DB"] is set to False if the environment variable is not set. Pull request to follow.

(I needed to setup $FUNANNOTATE2_DB just like I had previously setup $FUNANNOTATE_DB for v1)