Previously, when a template failed to compile because of a syntax error
(typically because we don't do any syntax checking when compiling
expression, allowing invalid expressions to be transpiled successfully),
the error reporting was very minimal: you would only get the error
message itself (eg: "Unexpected token") with the stack information of
the error pointing to the call to `new Function` in owl, which is not
very useful.
This commit catches the compilation error and completes it with
information about the template name when available, and also adds the
generated code to the error message, allowing the user to just
copy/paste it in their web console or code editor to get a more precise
location for the error.
Previously, we used an option to allow duplicate templates, if that
option was passed, we would always replace the existing template with
the new template, and if it wasn't, we would always throw an error even
if the template's content was the same.
Allowing to replace a template with a different one is problematic, as
it may or may not have already been compiled, which may cause various
problems. On the other hand, if the template is the same, there is no
point in throwing an error, as we can just silently ignore the second
addition.
Samuel Degueldre