f10c83b2788951052a605dccbca7b13e100f8d30
angie
  Thu Sep 17 11:07:52 2015 -0700
Oops, forgot to check whether a region search had no results - thx Matt!  fixes #16038

diff --git src/lib/annoStreamBigWig.c src/lib/annoStreamBigWig.c
index 933c0ba..7a93d1e 100644
--- src/lib/annoStreamBigWig.c
+++ src/lib/annoStreamBigWig.c
@@ -49,30 +49,33 @@
 if (self->intervalQueryLm == NULL)
     self->intervalQueryLm = lmInit(0);
 if (sSelf->chrom != NULL)
     {
     uint start = sSelf->regionStart;
     if (minChrom)
 	{
 	if (differentString(minChrom, sSelf->chrom))
 	    errAbort("annoStreamBigWig %s: nextRow minChrom='%s' but region chrom='%s'",
 		     sSelf->name, minChrom, sSelf->chrom);
 	if (start < minEnd)
 	    start = minEnd;
 	}
     self->intervalList = bigWigIntervalQuery(self->bbi, sSelf->chrom, start, sSelf->regionEnd,
 					     self->intervalQueryLm);
+    // If there are no intervals in the query region, we're done.
+    if (self->intervalList == NULL)
+        self->eof = TRUE;
     }
 else
     {
     // Genome-wide query: break it into chrom-by-chrom queries.
     if (self->queryChrom == NULL)
 	self->queryChrom = self->chromList;
     else
 	self->queryChrom = self->queryChrom->next;
     if (minChrom != NULL)
 	{
 	// Skip chroms that precede minChrom
 	while (self->queryChrom != NULL && strcmp(self->queryChrom->name, minChrom) < 0)
 	    self->queryChrom = self->queryChrom->next;
 	}
     if (self->queryChrom == NULL)