traceback on doc-view-search in cvs

[Neal Becker]

Recent emacs cvs.
Hitting C-s when viewing pdf gives:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  start-process("pdf->txt" " *doc-view conversion output*" nil "-raw" 
"/home/nbecker/numpybook.pdf" 
"/tmp/docview500/numpybook.pdf-637180cd704dc8be4036c09412501397/doc.txt")
  apply(start-process "pdf->txt" " *doc-view conversion output*" nil ("-raw" 
"/home/nbecker/numpybook.pdf" 
"/tmp/docview500/numpybook.pdf-637180cd704dc8be4036c09412501397/doc.txt"))
  doc-view-start-process("pdf->txt" nil ("-raw" "/home/nbecker/numpybook.pdf" 
"/tmp/docview500/numpybook.pdf-637180cd704dc8be4036c09412501397/doc.txt") #[nil 
"��!�" [doc-view-search nil] 2])
  doc-view-pdf->txt("/home/nbecker/numpybook.pdf" 
"/tmp/docview500/numpybook.pdf-637180cd704dc8be4036c09412501397/doc.txt" #[nil 
"��!�" [doc-view-search nil] 2])
  
doc-view-doc->txt("/tmp/docview500/numpybook.pdf-637180cd704dc8be4036c09412501397/doc.txt"
 #[nil "��!�" [doc-view-search nil] 2])
  doc-view-search(nil)
  call-interactively(doc-view-search nil nil)