Merge branch 'resuming-progress' of 'https://github.com/jjmerchante/grimoirelab-core'

Merges #37
Closes #37

Author: sduenas

src/grimoirelab/core/scheduler/tasks/models.py

@@ -131,8 +131,11 @@ def prepare_job_parameters(self):
             job_args = args_gen.initial_args(self.task_args)
         elif self.status == SchedulerStatus.COMPLETED:
             job = self.jobs.all().order_by('-job_num').first()
-            progress = ChroniclerProgress.from_dict(job.progress)
-            job_args = args_gen.resuming_args(job.job_args['job_args'], progress)
+            if job and job.progress:
+                progress = ChroniclerProgress.from_dict(job.progress)
+                job_args = args_gen.resuming_args(job.job_args['job_args'], progress)
+            else:
+                job_args = args_gen.initial_args(self.task_args)
         elif self.status == SchedulerStatus.RECOVERY:
             job = self.jobs.all().order_by('-job_num').first()
             if job and job.progress: