error when exporting to endote and ris format

[jdhao]

• JabRef version (available in the About box):JabRef_windows_3_3dev--snapshot--2016-03-18--master--70a65a6
• Operating system and version: windows 8.1 enterprise edition
• Steps to reproduce:
  1. open and bibtex file
  2. export(choose the endote or ris format)
  3. the program will tell you that there is an error "could not save the file, java.lang.NullPointerException"

[Siedlerchr]

Confirmed in latest development version:
Seems to have sth to do with the PR #982
I just looked into it, it seems to only happen when no Entries are selected.
However, selecting all entries and then clicking export works.

Full error:

WARN net.sf.jabref.exporter.ExportFormats - Problem exporting
java.lang.NullPointerException
at java.util.ArrayList.addAll(Unknown Source) ~[?:1.8.0_74]
at net.sf.jabref.exporter.BibDatabaseWriter.getSortedEntries(BibDatabaseWriter.java:97) ~[bin/:?]
at net.sf.jabref.exporter.ExportFormat.performExport(ExportFormat.java:230) ~[bin/:?]
at net.sf.jabref.exporter.ExportFormats$1ExportAction$1.run(ExportFormats.java:231) [bin/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_74]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_74]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_74]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_74]
at spin.Invocation.evaluate(Invocation.java:175) [spin.jar:?]
at spin.off.SpinOffEvaluator$1.run(SpinOffEvaluator.java:108) [spin.jar:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_74]

[oscargus]

Could you try the latest master (available in 20 minutes or so)? I had to push directly to the master as I forgot to create a separate branch...

[oscargus]

And, yes, it was only when no entries were selected. I also fixed another problem where the complete database was exported if no MetaData was present, even when entries where selected.