Fix handling of empty lines, add test

Author: JanJakes

features/sqlite-import.feature

@@ -151,3 +151,23 @@ Feature: WP-CLI SQLite Import Command
       """
 
     And the SQLite database should contain a table named "a'strange`identifier\name"
+
+  @require-sqlite
+  Scenario: Import a file with whitespace and empty lines
+    Given a SQL dump file named "test_import.sql" with content:
+      """
+
+      CREATE TABLE test_table (id INTEGER PRIMARY KEY AUTO_INCREMENT, name TEXT);
+
+
+      INSERT INTO test_table (name) VALUES ('Test Name');
+
+      """
+    When I run `wp sqlite --enable-ast-driver import test_import.sql`
+    Then STDOUT should contain:
+      """
+      Success: Imported from 'test_import.sql'.
+      """
+
+    And the SQLite database should contain a table named "test_table"
+    And the "test_table" should contain a row with name "Test Name"

src/Import.php

@@ -139,7 +139,10 @@ public function parse_statements( $sql_file_path ) {
 
 				// Process statement end
 				if ( ';' === $ch && null === $starting_quote ) {
-					yield trim( $buffer );
+					$buffer = trim( $buffer );
+					if ( ! empty( $buffer ) ) {
+						yield $buffer;
+					}
 					$buffer = '';
 				} else {
 					$buffer .= $ch;
@@ -148,8 +151,9 @@ public function parse_statements( $sql_file_path ) {
 		}
 
 		// Handle any remaining buffer content
+		$buffer = trim( $buffer );
 		if ( ! empty( $buffer ) ) {
-			yield trim( $buffer );
+			yield $buffer;
 		}
 
 		fclose( $handle );