File upload does not distinguish between zero-length file (error condition) and empty field (non error condition)

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: liferay-faces-2.1.0-ga1, liferay-faces-3.0.0-legacy-ga1, liferay-faces-3.0.0-ga1, liferay-faces-3.1.0-ga1
• Fix Version/s: liferay-faces-2.1.1-ga2, liferay-faces-3.0.1-legacy-ga2, liferay-faces-3.0.1-ga2, liferay-faces-3.1.1-ga2
• Component/s: Liferay Faces Bridge Impl / Demos / Tests
• Labels: None

The FACES-1415 issue introduced an check for non-existent uploaded files in the RequestParameterMapMultiPartImpl class. In the case of a zero-length uploaded file, this should be an error condition. But in the case of an empty field (the user didn't select a file with the "Choose..." button in the browser), it should not be an error condition.