Don't throw an exception of the DBName provided to a datoms model is undefined

Author: halgari

src/NexusMods.MnemonicDB/QueryFunctions/DatomsTableFunction.cs

@@ -215,8 +215,7 @@ protected override void Bind(BindInfo info)
         }
         else if (!dbNameParam.IsNull)
         {
-            var namedConn = _queryEngine.GetConnectionByName(dbNameParam.GetVarChar());
-            connection = namedConn ?? throw new Exception($"No database named {dbNameParam.GetVarChar()}");
+            connection = _queryEngine.GetConnectionByName(dbNameParam.GetVarChar());
             asOf = TxId.MinValue;
         }
         else

src/NexusMods.MnemonicDB/QueryFunctions/ModelTableFunction.cs

@@ -468,8 +468,7 @@ protected override void Bind(BindInfo info)
         }
         else if (!dbNameParam.IsNull)
         {
-            var namedConn = _engine.GetConnectionByName(dbNameParam.GetVarChar());
-            conn = namedConn ?? throw new Exception($"No database named {dbNameParam.GetVarChar()}");
+            conn = _engine.GetConnectionByName(dbNameParam.GetVarChar());
         }
         else
         {