diff --git a/dbt/adapters/databricks/column.py b/dbt/adapters/databricks/column.py
index e3ff5f91..4e15e912 100644
--- a/dbt/adapters/databricks/column.py
+++ b/dbt/adapters/databricks/column.py
@@ -67,7 +67,7 @@ def render_for_create(self) -> str:
             column_str += f" COMMENT '{comment}'"
         for constraint in self.constraints or []:
             c = constraints.process_column_constraint(constraint)
-            if c != "":
+            if c:
                 column_str += f" {c}"
         return column_str
 
diff --git a/tests/unit/test_constraints.py b/tests/unit/test_constraints.py
index 343e0b71..0b6fc593 100644
--- a/tests/unit/test_constraints.py
+++ b/tests/unit/test_constraints.py
@@ -1,3 +1,5 @@
+from unittest.mock import patch
+
 import pytest
 from dbt_common.contracts.constraints import (
     ColumnLevelConstraint,
@@ -5,7 +7,6 @@
     ModelLevelConstraint,
 )
 from dbt_common.exceptions import DbtValidationError
-from mock import patch
 
 from dbt.adapters.databricks import constraints