Reproducing a mysterious exception in RKFetchedResultsTableController (sections + empty item)

RKFetchedControllerSpecAddition.m

- (void)itShouldLoadFromNetworkUpdatingFromEmptyToFullWithSections {
    [self bootstrapEmptyStoreAndCache];
    [self stubObjectManagerToOnline];
    UITableView* tableView = [UITableView new];
    RKFetchedResultsTableControllerSpecViewController* viewController = [RKFetchedResultsTableControllerSpecViewController new];
    RKFetchedResultsTableController* tableController =
    [[RKFetchedResultsTableController alloc] initWithTableView:tableView viewController:viewController];
    tableController.resourcePath = @"/JSON/humans/all.json";
    tableController.sectionNameKeyPath = @"name";
    tableController.autoRefreshFromNetwork = YES;
    tableController.autoRefreshRate = 360;
    tableController.predicate = nil;
    tableController.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES]];
    [tableController setEmptyItem:[RKTableItem tableItemUsingBlock:^(RKTableItem* tableItem) {
        tableItem.text = @"Empty";
        tableItem.cellMapping = [RKTableViewCellMapping cellMappingUsingBlock:^(RKTableViewCellMapping* cellMapping) {
            [cellMapping addDefaultMappings];
        }];
    }]];

    RKTableViewCellMapping* cellMapping = [RKTableViewCellMapping mappingForClass:[UITableViewCell class]];
    [cellMapping mapKeyPath:@"name" toAttribute:@"textLabel.text"];
    RKTableViewCellMappings* mappings = [RKTableViewCellMappings new];
    [mappings setCellMapping:cellMapping forClass:[RKHuman class]];
    tableController.cellMappings = mappings;
    
    [tableController loadTable];
    
    assertThatInt([tableController rowCount], is(equalToInt(1)));
    UITableViewCell* cell = [tableController tableView:tableController.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
    assertThat(cell.textLabel.text, is(equalTo(@"Empty")));
    
    NSException *exception = nil;
    @try {
        RKSpecSpinRunLoopWithDuration(1);  // Put your breakpoint here
    }
    @catch (NSException *e) {
        exception = e;  // this doesn't seem to catch the exception, someone else is catching it first?
    }
    @finally {
        assertThat(exception, is(nilValue()));
    }
    
    assertThatInt([tableController rowCount], is(equalToInt(2)));
    cell = [tableController tableView:tableController.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
    assertThat(cell.textLabel.text, is(equalTo(@"Blake Watters")));
}