raise error on empty sequence (about #14)
raise error on empty sequence (about #14)

Sinatra returns an empty string for empty textboxes in the form.
Naturally 'unless sequence' would always evaluate to false. While it
fixes the original problem reported by NOLFXceptMe in #14, the error
handling still needs to improve ( which is currently handled by a poor
little 500.erb :P).

Perhaps, an ArgumentError should be reported to the user in the same
form, so that he can correct his mistake.

yeban/sequenceserver,IsmailM/sequenceserver,elsiklab/sequenceserver,IsmailM/sequenceserver,elsiklab/sequenceserver,elsiklab/sequenceserver,aldermossy/sequenceserver,aldermossy/sequenceserver,lepbase/lepbase-sequenceserver,deepakunni3/sequenceserver,jasminZ/sequenceserver,yeban/sequenceserver,lepbase/lepbase-sequenceserver,IsmailM/sequenceserver,vivekiitkgp/sequenceserver,yeban/sequenceserver,jasminZ/sequenceserver,vivekiitkgp/sequenceserver,aldermossy/sequenceserver,deepakunni3/sequenceserver,lepbase/lepbase-sequenceserver,vivekiitkgp/sequenceserver,yeban/sequenceserver,aldermossy/sequenceserver,jasminZ/sequenceserver,deepakunni3/sequenceserver