fix(controller): the project description cannot be set to empty

[dreamlandliu]

Description

Modules

• UI
• Controller
• Agent
• Client
• Python-SDK
• Others

Checklist

• run code format and lint check
• add unit test
• add necessary doc

[codecov]

Codecov Report

Merging #1268 (4d0b676) into main (f1c1603) will decrease coverage by 13.04%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##               main    #1268       +/-   ##
=============================================
- Coverage     73.84%   60.79%   -13.05%     
  Complexity     1210     1210               
=============================================
  Files           287      225       -62     
  Lines         13378     6349     -7029     
  Branches        651      651               
=============================================
- Hits           9879     3860     -6019     
+ Misses         3277     2267     -1010     
  Partials        222      222               

Flag	Coverage Δ
controller	60.79% <ø> (ø)
standalone	?
unittests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
client/starwhale/core/runtime/process.py
client/starwhale/utils/process.py
client/starwhale/core/runtime/model.py
client/starwhale/utils/load.py
client/starwhale/consts/__init__.py
client/starwhale/core/dataset/tabular.py
client/starwhale/base/mixin.py
client/starwhale/utils/venv.py
client/starwhale/utils/retry.py
client/starwhale/core/job/model.py
... and 52 more

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[goldenxinxing]

LGTM