fix: modify the error message returned

[littlejiancc]

What type of this PR

/kind bug

What this PR does / why we need it:

fix: modify the error message returned

Which issue(s) this PR fixes:

• Fixes #your-issue_number
• [Erda Cloud Issue Link](paste your link here)

Specified Reviewers:

/assign @sfwn

ChangeLog

Language	Changelog
🇺🇸 English	修改返回的错误信息
🇨🇳 中文	modify the error message returned

Need cherry-pick to release versions?

Add comment like /cherry-pick release/1.0 when this PR is merged.

For details on the cherry pick process, see the cherry pick requests section under CONTRIBUTING.md.

[codecov]

Codecov Report

Merging #1709 (e32cf6a) into master (7d733b0) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1709   +/-   ##
=======================================
  Coverage   13.67%   13.67%           
=======================================
  Files        1108     1108           
  Lines      114857   114865    +8     
=======================================
+ Hits        15703    15708    +5     
+ Misses      97603    97599    -4     
- Partials     1551     1558    +7     

Impacted Files	Coverage Δ
modules/pipeline/services/pipelinesvc/snippet.go	42.52% <0.00%> (+0.96%)	⬆️