properly handle BAD track additions about apollo

[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 -