Removed redundant error checks to fix issue #1412

[ssun30]

Changes proposed in this pull request

• Removes a redundant error check in clib/ct.cpp so external language interfaces can correctly handle errors returned by the method thermo_setDensity and thermo_setMolarDensity.

If applicable, fill in the issue number this pull request is fixing

Closes #1412

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 #1413 (3c76364) into main (7d86e26) will decrease coverage by 0.37%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1413      +/-   ##
==========================================
- Coverage   71.16%   70.79%   -0.38%     
==========================================
  Files         373      373              
  Lines       52276    53872    +1596     
  Branches    17374    17579     +205     
==========================================
+ Hits        37204    38139     +935     
- Misses      12718    13332     +614     
- Partials     2354     2401      +47     

Impacted Files	Coverage Δ
src/clib/ct.cpp	13.65% <ø> (+0.48%)	⬆️
src/numerics/ODE_integrators.cpp	40.00% <0.00%> (-10.00%)	⬇️
include/cantera/transport/Transport.h	18.69% <0.00%> (-8.34%)	⬇️
include/cantera/kinetics/ReactionData.h	67.85% <0.00%> (-8.15%)	⬇️
src/clib/clib_utils.h	21.42% <0.00%> (-7.15%)	⬇️
include/cantera/thermo/Phase.h	77.77% <0.00%> (-5.90%)	⬇️
src/zeroD/flowControllers.cpp	76.08% <0.00%> (-5.31%)	⬇️
src/numerics/funcs.cpp	66.66% <0.00%> (-5.27%)	⬇️
include/cantera/kinetics/Kinetics.h	30.59% <0.00%> (-5.06%)	⬇️
include/cantera/base/Delegator.h	64.70% <0.00%> (-5.02%)	⬇️
... and 178 more

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[ischoegl]

Thanks! - The fix looks good to me.