TimeZoneSerializerField should allow empty strings when required=False

[ejain]

No description provided.

[paulocoutinhox]

do you have a sample code to i understand?

[mfogel]

This isn't quite what required=True does - this allows the field to be omitted altogether - which is different then specifying the field as the empty string (or as None). This is documented here

Once #137 is merged, you can use the allow_blank=True kwarg to allow empty strings if you so desire.

[ejain]

@mfogel Perfect, thanks!