Fix error message for unit conversions involving unit "1" #462
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As described in #458, there is a problem with the unit converter if
attempting to convert from unit "1" to any other value: while this
should result in an error (units of "1" can't be converted to anything
else), the error that results is not descriptive (due to "1" not being a
valid python function name). This change adds an if statement to
correctly pass "1" as a valid unit so that the correct error message
is printed.
User interface changes?: No
Fixes: #458 Unit converter does not handle units = 1 correctly for incompatible conversions
Testing:
test removed: None
unit tests: All existing passed. Added new unit test for validating the string_to_python_identifier() function for both valid and invalid inputs
system tests: None
manual testing: Ran ccpp_prebuild with SCM with a modified metadata file to confirm both error and fix (posted comment in issue with more details).