HttpHeaders.setContentDispositionFormData should ignore empty filename

[npimentel]

When a Multipart Form request is used with an empty string as Filename, a "No Filename" exception is thrown. Can an empty String check be added to prevent the code from failing in empty string scenarios?

spring-framework/spring-web/src/main/java/org/springframework/http/HttpHeaders.java

Line 864 in 3b0f14f

if (filename != null) {

public void setContentDispositionFormData(String name, @Nullable String filename) {
		Assert.notNull(name, "Name must not be null");
		ContentDisposition.Builder disposition = ContentDisposition.builder("form-data").name(name);
		 if (filename != null) {  // Add Empty String check here, don't let through if empty String
			disposition.filename(filename);    // calls method below
		}
		setContentDisposition(disposition.build());
	}

spring-framework/spring-web/src/main/java/org/springframework/http/ContentDisposition.java

Line 601 in 29885e2

Assert.hasText(filename, "No filename");

@Override
		public Builder filename(String filename) {
			Assert.hasText(filename, "No filename");  // Assertion Fails since the the filename does not have text
			this.filename = filename;
			return this;
		}