uuid: 1961288312a6

When given empty input, return an empty uuid. If we're given empty input while creating a UUID, we should return an empty UUID.

     1.1 --- a/uuid.go	Fri Jan 09 02:42:22 2015 -0500
     1.2 +++ b/uuid.go	Tue Jul 14 00:07:25 2015 -0400
     1.3 @@ -40,6 +40,10 @@
     1.4  	}
     1.5  	switch src.(type) {
     1.6  	case []byte:
     1.7 +		if len(src.([]byte)) == 0 {
     1.8 +			*id = (*id)[:0]
     1.9 +			return nil
    1.10 +		}
    1.11  		newID, err := Parse(string(src.([]byte)))
    1.12  		if err != nil {
    1.13  			return err
    1.14 @@ -47,6 +51,10 @@
    1.15  		*id = append((*id)[:0], newID...)
    1.16  		return nil
    1.17  	case string:
    1.18 +		if len(src.(string)) == 0 {
    1.19 +			*id = (*id)[:0]
    1.20 +			return nil
    1.21 +		}
    1.22  		newID, err := Parse(src.(string))
    1.23  		if err != nil {
    1.24  			return err