Description of problem:
I've seen a couple of dist-git imports fail today. Example builds are:
https://copr.fedorainfracloud.org/coprs/jerboaa/rh-thermostat16/build/455388/
https://copr.fedorainfracloud.org/coprs/jerboaa/thermostat-latest/build/455452/

Actual results:

2. Task: 455388-master, importing the package: https://copr.fedorainfracloud.org/tmp/tmpghpxDy/thermostat-1.6.6-1.fedora.src.rpm
downloading package https://copr.fedorainfracloud.org/tmp/tmpghpxDy/thermostat-1.6.6-1.fedora.src.rpm
Verifying packagage, getting  name and version.
make sure repos exist: jerboaa/rh-thermostat16/thermostat
importing srpm into the dist-git
repo_dir: /tmp/tmpYA1lhG/thermostat
clone the pkg repository into tmp directory
Checking out a specific branch ssh://copr-dist-git@localhost/jerboaa/rh-thermostat16/thermostat
Running git clone -b master ssh://copr-dist-git@localhost/jerboaa/rh-thermostat16/thermostat --origin origin and logging output

import the source rpm into git and save filenames of sources
Creating repo object from /tmp/tmpYA1lhG/thermostat
Running: rpm -qp --nosignature --qf %{NAME} /tmp/tmp5rThmZ/package.src.rpm
Running: rpm -qpl /tmp/tmp5rThmZ/package.src.rpm
save the source files into lookaside cache
Exception raised during srpm import:
Traceback (most recent call last):
  File "/usr/share/copr/dist_git/dist_git_importer.py", line 529, in do_import
    task.git_hash = self.git_import_srpm(task, fetched_srpm_path)
  File "/usr/share/copr/dist_git/dist_git_importer.py", line 454, in git_import_srpm
    return do_git_srpm_import(self.opts, filepath, task, tmp)
  File "/usr/share/copr/dist_git/srpm_import.py", line 118, in do_git_srpm_import
    raise PackageImportException("Failed to import the source rpm: {}".format(src_filepath))
PackageImportException: Failed to import the source rpm: /tmp/tmp5rThmZ/package.src.rpm
Sending back: 
{"task_id": "455388-master", "error": "srpm_import_failed"}


Expected results:
Import works.