Fix potential NPE when passing 'null' as params

Author: mhalbritter

Diff for: spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/DockerApi.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -117,9 +117,11 @@ private URI buildUrl(String path, Collection<?> params) {
 	private URI buildUrl(String path, Object... params) {
 		try {
 			URIBuilder builder = new URIBuilder("/" + API_VERSION + path);
-			int param = 0;
-			while (param < params.length) {
-				builder.addParameter(Objects.toString(params[param++]), Objects.toString(params[param++]));
+			if (params != null) {
+				int param = 0;
+				while (param < params.length) {
+					builder.addParameter(Objects.toString(params[param++]), Objects.toString(params[param++]));
+				}
 			}
 			return builder.build();
 		}