Fixing minor warnings from code analysis.

Author: jgebal

src/main/java/org/utplsql/cli/datasource/TestedDataSourceProvider.java

@@ -87,15 +87,15 @@ private void setInitSqlFrom_NLS_LANG(InitializableOracleDataSource ds) {
                     sqlCommands.add(String.format("ALTER SESSION SET NLS_TERRITORY='%s'", matcher.group(2)));
                 }
 
-                if (sqlCommands.size() > 0) {
+                if (!sqlCommands.isEmpty()) {
                     StringBuilder sb = new StringBuilder();
                     sb.append("BEGIN\n");
                     for (String command : sqlCommands) {
                         sb.append(String.format("EXECUTE IMMEDIATE q'[%s]';\n", command));
                     }
                     sb.append("END;");
 
-                    logger.debug("NLS settings: {}", sb.toString());
+                    logger.debug("NLS settings: {}", sb);
                     ds.setConnectionInitSql(sb.toString());
                 }
             }