fixing up the static symlink tool to skip empty or non existent apps.
fixing up the static symlink tool to skip empty or non existent apps.

this is helpful to later symlihnk over the admin-media from python itself

dimagi/commcare-hq,puttarajubr/commcare-hq,dimagi/commcare-hq,puttarajubr/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,puttarajubr/commcare-hq,gmimano/commcaretest,SEL-Columbia/commcare-hq,puttarajubr/commcare-hq,qedsoftware/commcare-hq