Fix two issues shown by bug 489995

testing/resources/javascript/document_methods.in

 {{header}}
 {{object 1 0}} <<
   /Type /Catalog
   /Pages 2 0 R
   /OpenAction 10 0 R
 >>
 endobj
 {{object 2 0}} <<
   /Type /Pages
   /Count 4
@@ skipping 104 matching lines @@
    // Method is present.
    expect('typeof this.addIcon', 'function');
 
    // Method takes exactly two arguments.
    expectError('this.addIcon()');
    expectError('this.addIcon(1)');
    expectError('this.addIcon(1, 2, 3)');
 
    // Second argument must actually be an icon.
    expectError('this.addIcon("myicon", 3)');
+   expectError('this.addIcon("myicon", undefined)');
 
    // TODO(tsepez): test success cases.
 }
 
 function testCalculateNow() {
    // Method is present.
    expect('typeof this.calculateNow', 'function');
 
    // TODO(tsepez): test with no permissions.
    // TODO(tsepez): test success cases.
@@ skipping 178 matching lines @@
 }
 endstream
 endobj
 {{xref}}
 trailer <<
   /Root 1 0 R
   /Info 9 0 R
 >>
 {{startxref}}
 %%EOF