Later revisions might have removed the submodules so we want to keep
going when there are no submodules present.
We still abort when there is an error initializing submodules.
Fixesfdroid/fdroidserver#231
Running `fdroid verify` I was seeing FDroidExceptions from verify.py:98
that had a tuple rather than a string.
Traceback (most recent call last):
File "/home/hans/code/fdroid/server/fdroid", line 152, in <module>
main()
File "/home/hans/code/fdroid/server/fdroid", line 128, in main
mod.main()
File "/home/hans/code/fdroid/server/fdroidserver/verify.py", line 98, in main
logging.info("...NOT verified - {0}".format(e))
File "/home/hans/code/fdroid/server/fdroidserver/exception.py", line 22, in __str__
ret += "\n==== detail begin ====\n%s\n==== detail end ====" % ''.join(self.detail).strip()
TypeError: sequence item 1: expected str instance, HTTPError found