cleanup: do not load JS for error page 500
cleanup: do not load JS for error page 500

Loading JS for error pages is unwarranted.

Signed-off-by: Anurag Priyam <6e6ab5ea9cb59fe7c35d2a1fc74443577eb60635@gmail.com>

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