HHH-14317 Avoid closing datasource in AgroalConnectionProvider if datasource is not initialized

Author: gsmet

hibernate-agroal/src/main/java/org/hibernate/agroal/internal/AgroalConnectionProvider.java

@@ -139,6 +139,8 @@ public <T> T unwrap(Class<T> unwrapType) {
 
 	@Override
 	public void stop() {
-		agroalDataSource.close();
+		if ( agroalDataSource != null ) {
+			agroalDataSource.close();
+		}
 	}
 }