Do not clobber $EVAL_ERROR by localizing before eval

[ehuelsmann]

Description

Protect the caller's value of $@ by localizing it before calling eval.

Please note that only a PR for 1.x is required as 2.x (master) already has the required localizations in place.

Fixes/addresses (If applicable) # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project, please see the contribution guidelines.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[coveralls]

Coverage: 82.353% (-0.009%) from 82.362% when pulling 895ca22 on fix/1.x/clobbered-eval_error into b2d7366 on 1.x.

[jonasbn]

Looks good, approved