MINERVANET - Error Report #32 - attempt to export only Mesh annotations
```
id: 32
url: https://pg-sandbox.uni.lu/minerva/export.xhtml?id=pd_map_spring_18
login: ewa.smula
email: ewa.smula@uni.lu
browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.3 Safari/605.1.15
timestamp: 2019-02-14T15:31:56Z
version: 12.2.0~beta.1
comment: attempt to export only MeshAnnotation
stacktrace: Error: You must select at least one column
GuiMessageError@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:238129:26
promiseReactionJob@[native code]
>From previous event:
onclick@https://pg-sandbox.uni.lu/minerva/javax.faces.resource/minerva.js.xhtml?ln=js&m_version=c16fe7092b7ebece353383a932d997bacf7d4648:247866:39
.
```
`
@ewa.smula`
issue