Run query on DB

.travis.yml

@@ -28,7 +28,7 @@ env:
 before_script:
   - psql -c "create database lemur;" -U postgres
   - psql -c "create user lemur with password 'lemur;'" -U postgres
-  - psql -c "create extension pg_trgm with schema pg_catalog;" -U postgres
+  - psql lemur -c "create extension IF NOT EXISTS pg_trgm with schema pg_catalog;" -U postgres
   - npm config set registry https://registry.npmjs.org
   - npm install -g bower
   - pip install --upgrade setuptools

lemur/migrations/versions/ee827d1e1974_.py

@@ -14,12 +14,8 @@ from alembic import op
 from sqlalchemy.exc import ProgrammingError
 
 def upgrade():
-    try:
-        connection = op.get_bind()
-        connection.execute("CREATE EXTENSION pg_trgm")
-    except ProgrammingError as e:
-        # Extension is most likely already enabled
-        connection.execute("ROLLBACK")
+    connection = op.get_bind()
+    connection.execute("CREATE EXTENSION IF NOT EXISTS pg_trgm")
 
     op.create_index('ix_certificates_cn', 'certificates', ['cn'], unique=False, postgresql_ops={'cn': 'gin_trgm_ops'},
                     postgresql_using='gin')