Fix!: use dummy sqlmesh version if it doesn't exist prior to migrating (#1643)

* Fix: use dummy sqlmesh version if it doesn't exist prior to migrating

* Simplify

Author: georgesittas

sqlmesh/core/state_sync/engine_adapter.py

@@ -25,6 +25,7 @@
 import pandas as pd
 from sqlglot import __version__ as SQLGLOT_VERSION
 from sqlglot import exp
+from sqlglot.helper import seq_get
 
 from sqlmesh.core import constants as c
 from sqlmesh.core.audit import ModelAudit
@@ -478,10 +479,16 @@ def _get_versions(self, lock_for_update: bool = False) -> Versions:
         query = exp.select("*").from_(self.versions_table)
         if lock_for_update:
             query.lock(copy=False)
+
         row = self.engine_adapter.fetchone(query, quote_identifiers=True)
         if not row:
             return no_version
-        return Versions(schema_version=row[0], sqlglot_version=row[1], sqlmesh_version=row[2])
+
+        return Versions(
+            schema_version=row[0],
+            sqlglot_version=row[1],
+            sqlmesh_version=seq_get(row, 2) or "0.0.0",
+        )
 
     def _get_environment(
         self, environment: str, lock_for_update: bool = False