* htmlreport/check.sh: Remove check with obsolete file
gui/test/data/xmlfiles/xmlreport_v1.xml has been removed with commit
d95efc44c7
* .travis.yml: Enable htmlreport test again
* cppcheck-htmlreport: Fall back to guessing lexer from file content
If the lexer can not be guessed from the file extension (for example
for *.tpp) then guess the lexer that should be used from the content.
This fixes "ERROR: *" output when running "htmlreport/check.sh"
Also use specific exceptions instead of bare ones.
Sebastian
Matthias Krüger