Expand filedata check when running a service.
Expand filedata check when running a service.

For objects that have a filedata attribute make sure it is not None
before calling seek().

Fixes #399.

ckane/crits,HardlyHaki/crits,cdorer/crits,DukeOfHazard/crits,cdorer/crits,davidhdz/crits,0x3a/crits,davidhdz/crits,jinverar/crits,HardlyHaki/crits,jhuapl-marti/marti,cdorer/crits,Magicked/crits,HardlyHaki/crits,kaoscoach/crits,Lambdanaut/crits,seanthegeek/crits,lakiw/cripts,cfossace/crits,ckane/crits,seanthegeek/crits,dreardon/crits,blaquee/crits,cfossace/crits,lakiw/cripts,kaoscoach/crits,korrosivesec/crits,seanthegeek/crits,jhuapl-marti/marti,cfossace/crits,jinverar/crits,lakiw/cripts,blaquee/crits,dreardon/crits,Magicked/crits,0x3a/crits,Magicked/crits,Lambdanaut/crits,lakiw/cripts,blaquee/crits,ckane/crits,jinverar/crits,cfossace/crits,dreardon/crits,dreardon/crits,seanthegeek/crits,jhuapl-marti/marti,davidhdz/crits,Magicked/crits,cdorer/crits,0x3a/crits,HardlyHaki/crits,DukeOfHazard/crits,DukeOfHazard/crits,jhuapl-marti/marti,korrosivesec/crits,seanthegeek/crits,korrosivesec/crits,0x3a/crits,davidhdz/crits,blaquee/crits,kaoscoach/crits,ckane/crits,davidhdz/crits,DukeOfHazard/crits,kaoscoach/crits,Lambdanaut/crits,jinverar/crits,korrosivesec/crits,Lambdanaut/crits