The multi color settings

Hi Josh!

Thanks so much for a great plugin and Merry Christmas!

But I found one small flaw. If assign the colors not in a default sequence but selectively ( for example 2 and 4), then the output array of color settings in HTML will be incorrect.

Original code (flurry.php, rows 740-751):

	// Set array of colors
	if (
		isset( $options['color'] ) ||
		isset( $options['color2'] ) ||
		isset( $options['color3'] ) ||
		isset( $options['color4'] )
	) {
		$options['color'] = array_filter( array( $options['color'], $options['color2'], $options['color3'], $options['color4'] ) );
		unset( $options['color2'] );
		unset( $options['color3'] );
		unset( $options['color4'] );
	}

HTML output:

"color":{"1":"#ffffdd","3":"#ffffdd"}

The js script don’t accept this color settings and the flakes are black. I think it’s better to assign unassigned colors to white by default, then the output of the colors settings will be correct always.

	// Set array of colors
	if (
		isset( $options['color'] ) ||
		isset( $options['color2'] ) ||
		isset( $options['color3'] ) ||
		isset( $options['color4'] )
	) {
		if ( is_null( $options['color'] ) ) {
			$options['color'] = '#ffffff';
		}
		if ( is_null( $options['color2'] ) ) {
			$options['color2'] = '#ffffff';
		}
		if ( is_null( $options['color3'] ) ) {
			$options['color3'] = '#ffffff';
		}
		if ( is_null( $options['color4'] ) ) {
			$options['color4'] = '#ffffff';
		}
		$options['color'] = array( $options['color'], $options['color2'], $options['color3'], $options['color4'] );
		unset( $options['color2'] );
		unset( $options['color3'] );
		unset( $options['color4'] );
	}

HTML output:

"color":["#ffffff","#ffffdd","#ffffff","#ffffdd"]

Best regards sincerely, Dmitriy.