code-review-database: Always try to create the database

If the database doesn't exist, we get this error:

    Error: near line 3: no such table: merge_bases

This is because `sqlite3` will always create a new database if it
doesn't exist when running a command against a database. The
newly-created database doesn't have the required table, and we get the
error.

Fix the problem by ensuring the database always exists and is
initialised properly.

1 files changed, 3 insertions, 0 deletions

diff --git a/code-review-database b/code-review-database
index 50e6f68..5c931c6 100644
--- a/code-review-database
+++ b/code-review-database
@@ -91,3 +91,6 @@ function get_merge_base () {
 function current_branch () {
 	git rev-parse --abbrev-ref HEAD
 }
+
+
+create_database_if_not_exists