Check for valid component name when setting advance limits

[speth]

The Reactor::componentIndex function returns npos when an unknown component is specified, rather than throwing an error. This condition needs to be checked when setting an advance limit to avoid writing to invalid memory locations.

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Closes #1213

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Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[codecov]

Codecov Report

Merging #1215 (ba9d49f) into main (e6a5ffd) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1215      +/-   ##
==========================================
+ Coverage   65.42%   65.43%   +0.01%     
==========================================
  Files         320      320              
  Lines       46247    46249       +2     
  Branches    19655    19657       +2     
==========================================
+ Hits        30259    30265       +6     
+ Misses      13460    13454       -6     
- Partials     2528     2530       +2     

Impacted Files	Coverage Δ
src/zeroD/Reactor.cpp	81.31% <100.00%> (+0.82%)	⬆️
src/zeroD/IdealGasReactor.cpp	87.65% <0.00%> (+2.46%)	⬆️

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[ischoegl]

Looks good to me!