fixed typo

toargridding/static_metadata.py

@@ -103,7 +103,7 @@ class TOARVariable:
             if var.name==name:
                 return var
         else:
-            raise ValueError(f"TOAR Database contains no variable {name}"
+            raise ValueError(f"TOAR Database contains no variable {name}")
 
     @property
     def toar_id(self):