Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.0.1)
// ----


$color-amber: (
  '50': #fff8e1,
  '100': #ffecb3,
  '200': #ffe082,
  '300': #ffd54f,
  '400': #ffca28,
  '500': #ffc107,
  '600': #ffb300,
  '700': #ffa000,
  '800': #ff8f00,
  '900': #ff6f00,
  'A100': #ffe57f,
  'A200': #ffd740,
  'A400': #ffc400,
  'A700': #ffab00
);

$theme-name: 'amber';
$primary-color-palette: $color-amber;

.md-available-colors-#{$theme-name} {

    & .colorNames {
        content: map-keys($primary-color-palette) ;
        }

    & .colorNamesinError {
        content: "#{map-keys($primary-color-palette)}" ;
        }
    & .colorValues {
        content: "#{map-values($primary-color-palette)}";
        }

    }

SassMeister-output.css

.md-available-colors-amber .colorNames {
  content: '50', '100', '200', '300', '400', '500', '600', '700', '800', '900', 'A100', 'A200', 'A400', 'A700'; }
.md-available-colors-amber .colorNamesinError {
  content: "5','10','20','30','40','50','60','70','80','90','A10','A20','A40','A700"; }
.md-available-colors-amber .colorValues {
  content: "#fff8e1, #ffecb3, #ffe082, #ffd54f, #ffca28, #ffc107, #ffb300, #ffa000, #ff8f00, #ff6f00, #ffe57f, #ffd740, #ffc400, #ffab00"; }

There seems to be an problem with Libsass 3.0.1 and the map-keys function.
Have a close look at the difference between & .colorNames { content and & .colorNamesinError { content.

with sass 3.4.x it seems to work as expected.