Define error e if not defined

[samwaseda]

See lines changed

[github-actions[bot]]

:point_left: Launch a binder notebook on branch _pyiron/pyiron_workflow/definee

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.02% (target: -1.00%)	:white_check_mark: 33.33%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (9e776adc3cbcfefcfaa9357205ffc3ecf0540133) | 3375 | 3089 | 91.53% | | | Head commit (8a03e167a4232a2190e123bfb3f0259085e1e03d) | 3377 (+2) | 3090 (+1) | 91.50% (**-0.02%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#499) | 3 | 1 | **33.33%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[coveralls]

Pull Request Test Coverage Report for Build 11948250445

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 91.501%

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Files with Coverage Reduction	New Missed Lines	%
storage.py	2	96.19%
<!--	Total:	2		-->

Totals
Change from base Build 11943477483:	-0.03%
Covered Lines:	3090
Relevant Lines:	3377

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💛 - Coveralls

[samwaseda]

Yeah there was an error related to this line that I couldn't really explain. In that moment it looked like this change would fix the problem, but it didn't, so we can also close this PR if you want.

[liamhuber]

No no, this is formally correct so I'm ok with merging it