Special check for 'calculation.job.JobCalculation' in _get_calculatio…

…n_info_row

Calculations of the base class JobCalculation will have the class name string
'calculation.job.JobCalculation'. In the _get_calculation_info_row method
the module will therefore be, after the rsplit on the class name, like

    calculation.job

this does not include a period on the end like non base modules would have.
In this exceptional case, the calculation type that is to be returned should
simply be the 'calculation.job' base module

aiida/orm/implementation/general/calculation/job/__init__.py

@@ -1094,9 +1094,14 @@ def _get_calculation_info_row(cls, res, projections, times_since=None):
             calculation_class = from_type_to_pluginclassname(calculation_type)
             module, class_name = calculation_class.rsplit('.', 1)
 
-            assert(module.startswith(prefix))
-
-            d['calculation']['type'] = module[len(prefix):]
+            # For the base class 'calculation.job.JobCalculation' the module at this point equals 'calculation.job'
+            # For this case we should simply set the type to the base module calculation.job. Otherwise we need
+            # to strip the prefix to get the proper sub module
+            if module == prefix.rstrip('.'):
+                d['calculation']['type'] = module[len(prefix):]
+            else:
+                assert module.startswith(prefix), "module '{}' does not start with '{}'".format(module, prefix)
+                d['calculation']['type'] = module[len(prefix):]
         except KeyError:
             pass
         for proj in ('ctime', 'mtime'):