properly handle BAD track additions

[nathandunn]

e.g., when importing a GFF3 file with both gene and mRNA on the same region into jbrowse, when the imported track is annotated, it causes an error, but still "adds" the annotation and leaves the database in an inconsistent state. It also is unclear what would be annotated, as well. We should disallow this type of annotation explicitly.

[nathandunn]

This is the error we get:

15:13:25.506 [http-bio-8080-exec-1] DEBUG  - range: null
java.lang.NullPointerException
    at org.bbop.apollo.editor.AnnotationEditor.findNonCanonicalAcceptorDonorSpliceSites(AnnotationEditor.java:1150)
    at org.bbop.apollo.web.AnnotationEditorService.findNonCanonicalAcceptorDonorSpliceSites(AnnotationEditorService.java:2153)
    at org.bbop.apollo.web.AnnotationEditorService.addTranscript(AnnotationEditorService.java:4255)
    at org.bbop.apollo.web.AnnotationEditorService.addTranscript(AnnotationEditorService.java:1218)
    at org.bbop.apollo.web.AnnotationEditorService.addTranscript(AnnotationEditorService.java:1202)
    at org.bbop.apollo.web.AnnotationEditorService.doPost(AnnotationEditorService.java:367)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)

And the client says: "Error writing transcript: null"

[nathandunn]

@deepakunni3 Feel free to kick this down the road (2.1) if it looks tough. Basically, should issue an error of some type. It might be that this is more appropriate for @cmdcolin as well.

[monicacecilia]

We have not ran into this again -