patch 7.4.1503

Problem:    Crash when using ch_getjob(). (Damien)
Solution:   Check for a NULL job.

src/eval.c

@@ -15249,6 +15249,7 @@ f_job_start(typval_T *argvars UNUSED, typval_T *rettv)
 #endif
 
 #ifdef FEAT_CHANNEL
+    /* If the channel is reading from a buffer, write lines now. */
     channel_write_in(job->jv_channel);
 #endif
 
@@ -22601,7 +22602,11 @@ get_tv_string_buf_chk(typval_T *varp, char_u *buf)
 #ifdef FEAT_JOB
 	    {
 		job_T *job = varp->vval.v_job;
-		char  *status = job->jv_status == JOB_FAILED ? "fail"
+		char  *status;
+
+		if (job == NULL)
+		    return (char_u *)"no process";
+		status = job->jv_status == JOB_FAILED ? "fail"
 				: job->jv_status == JOB_ENDED ? "dead"
 				: "run";
 # ifdef UNIX

src/testdir/test_channel.vim

@@ -108,6 +108,10 @@ func s:communicate(port)
     call assert_false(1, "Can't open channel")
     return
   endif
+  if has('job')
+    " check that no job is handled correctly
+    call assert_equal('no process', string(ch_getjob(handle)))
+  endif
 
   " Simple string request and reply.
   call assert_equal('got it', ch_evalexpr(handle, 'hello!'))

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1503,
 /**/
     1502,
 /**/