Description of problem:
Fedora 26, problem occurs during the first run.
Happens in fresh installation of F26 too.

Version-Release number of selected component:
khard-0.11.3-3.fc26

Additional info:
reporter:       libreport-2.9.1
cmdline:        /usr/bin/python3 /usr/bin/khard
crash_function: resolve
exception_type: pkg_resources.ContextualVersionConflict
executable:     /usr/bin/khard
kernel:         4.11.11-300.fc26.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
__init__.py:857:resolve:pkg_resources.DistributionNotFound: The 'vobject==0.9.2' distribution was not found and is required by khard

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 657, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 971, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 862, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (vobject 0.9.4.1 (/usr/lib/python3.6/site-packages), Requirement.parse('vobject==0.9.2'), {'khard'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/khard", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3038, in <module>
    @_call_aside
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3022, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3051, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 659, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 672, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 857, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'vobject==0.9.2' distribution was not found and is required by khard

Local variables in innermost frame:
new_requirement: Requirement.parse('atomicwrites')
new_requirements: [Requirement.parse('vobject==0.9.2'), Requirement.parse('pyyaml'), Requirement.parse('configobj'), Requirement.parse('atomicwrites')]
requirers: {'khard'}
ws: <pkg_resources.WorkingSet object at 0x7f7e51ed49b0>
dist: None
req: Requirement.parse('vobject==0.9.2')
required_by: defaultdict(<class 'set'>, {Requirement.parse('vobject==0.9.2'): {'khard'}, Requirement.parse('pyyaml'): {'khard'}, Requirement.parse('configobj'): {'khard'}, Requirement.parse('atomicwrites'): {'khard'}})
req_extras: {Requirement.parse('vobject==0.9.2'): (), Requirement.parse('pyyaml'): (), Requirement.parse('configobj'): (), Requirement.parse('atomicwrites'): ()}
to_activate: [khard 0.11.3 (/usr/lib/python3.6/site-packages)]
best: {'khard': khard 0.11.3 (/usr/lib/python3.6/site-packages), 'vobject': None}
processed: {Requirement.parse('khard==0.11.3'): True}
extras: None
replace_conflicting: False
installer: None
env: <pkg_resources.Environment object at 0x7f7e51ed4828>
requirements: [Requirement.parse('pyyaml'), Requirement.parse('configobj'), Requirement.parse('atomicwrites')]
self: <pkg_resources.WorkingSet object at 0x7f7e51ed49b0>