fixes #6820 - apipie-bindings should enforce required params, BZ 1116803

- [x] validation of nested routes
- [x] do not rely on `gettext`
- [ ] tests!
ah I see. okay cool. I will leave this as StandardError then. thanks!  

On Friday, August 1, 2014 at 9:21 AM, mbacovsky wrote:  
> In lib/apipie_bindings/exceptions.rb:
> > @@ -3,4 +3,13 @@ module ApipieBindings > class ConfigurationError < StandardError; end > class DocLoadingError < StandardError; end > > + class MissingArgumentsError < StandardError  
> @komidore64 (https://github.com/komidore64) I discussed that with Google and just about every article or blogpost suggested to inherit custom exceptions from StandardError. In my understanding RuntimeError is used rather for generic unhendled unexpected situation. So if you know what had happened and have specific exception for that raise it, Raise RuntimeError otherwise.
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> Reply to this email directly or view it on GitHub (https://github.com/Apipie/apipie-bindings/pull/12/files#r15695026).
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