Fix nil write session panic

[max-hoffman]

No description provided.

[zachmu]

LGTM

[zachmu]

"Cannot rebuild index on read-only database %s"

[zachmu]

false

[coffeegoddd]

@max-hoffman DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
846a102	ok	5937457

version	total_tests
846a102	5937457

correctness_percentage
100.0

[coffeegoddd]

@max-hoffman DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
4c7c436	ok	5937457

version	total_tests
4c7c436	5937457

correctness_percentage
100.0

[coffeegoddd]

@coffeegoddd DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
3286c11	ok	5937457

version	total_tests
3286c11	5937457

correctness_percentage
100.0

[github-actions]

@coffeegoddd DOLT

test_name	detail	row_cnt	sorted	mysql_time	sql_mult	cli_mult
batching	LOAD DATA	10000	1	0.05	1.4
batching	batch sql	10000	1	0.07	2
batching	by line sql	10000	1	0.07	1.86
blob	1 blob	200000	1	0.9	4.02	4.47
blob	2 blobs	200000	1	0.87	5.08	5.64
blob	no blob	200000	1	0.89	2.1	2.2
col type	datetime	200000	1	0.81	2.63	2.84
col type	varchar	200000	1	0.68	3.09	3.28
config width	2 cols	200000	1	0.76	2.22	2.32
config width	32 cols	200000	1	1.9	1.75	2.51
config width	8 cols	200000	1	0.98	2.04	2.32
pk type	float	200000	1	0.85	2.2	2.08
pk type	int	200000	1	0.76	2.54	2.3
pk type	varchar	200000	1	1.56	1.46	1.47
row count	1.6mm	1600000	1	5.69	2.46	2.56
row count	400k	400000	1	1.4	2.43	2.56
row count	800k	800000	1	2.85	2.43	2.55
secondary index	four index	200000	1	3.59	1.28	1.08
secondary index	no secondary	200000	1	0.89	2.1	2.22
secondary index	one index	200000	1	1.14	2.08	2.15
secondary index	two index	200000	1	1.99	1.57	1.52
sorting	shuffled 1mm	1000000	0	5.39	2.48	2.46
sorting	sorted 1mm	1000000	1	5.34	2.49	2.47

[github-actions]

@coffeegoddd DOLT

name	detail	mean_mult
dolt_blame_basic	system table	1.28
dolt_blame_commit_filter	system table	3.31
dolt_commit_ancestors_commit_filter	system table	0.81
dolt_commits_commit_filter	system table	0.94
dolt_diff_log_join_from_commit	system table	2.07
dolt_diff_log_join_to_commit	system table	2.1
dolt_diff_table_from_commit_filter	system table	1.1
dolt_diff_table_to_commit_filter	system table	1.14
dolt_diffs_commit_filter	system table	1
dolt_history_commit_filter	system table	1.22
dolt_log_commit_filter	system table	0.97

[github-actions]

@coffeegoddd DOLT

name	add_cnt	delete_cnt	update_cnt	latency
adds_only	60000	0	0	0.7
adds_updates_deletes	60000	60000	60000	3.74
deletes_only	0	60000	0	1.85
updates_only	0	0	60000	2.43