Fix segfault with blast6out and output_no_hits options

Author: torognes

src/results.cc

@@ -194,29 +194,31 @@ void results_show_blast6out_one(FILE * fp,
     but only 12 when there is a hit. Fixed in VSEARCH.
   */
 
-  if (not hp)
+  if (hp)
+    {
+      // if 'hp->strand' then 'minus strand' else 'plus strand'
+      const int qstart = hp->strand ? qseqlen : 1;
+      const int qend = hp->strand ? 1 : qseqlen;
+
+      fprintf(fp,
+	      "%s\t%s\t%.1f\t%d\t%d\t%d\t%d\t%d\t%d\t%" PRIu64 "\t%d\t%d\n",
+	      query_head,
+	      db_getheader(hp->target),
+	      hp->id,
+	      hp->internal_alignmentlength,
+	      hp->mismatches,
+	      hp->internal_gaps,
+	      qstart,
+	      qend,
+	      1,
+	      db_getsequencelen(hp->target),
+	      -1,
+	      0);
+    }
+  else
     {
       fprintf(fp, "%s\t*\t0.0\t0\t0\t0\t0\t0\t0\t0\t-1\t0\n", query_head);
     }
-
-  // if 'hp->strand' then 'minus strand' else 'plus strand'
-  const int qstart = hp->strand ? qseqlen : 1;
-  const int qend = hp->strand ? 1 : qseqlen;
-
-  fprintf(fp,
-          "%s\t%s\t%.1f\t%d\t%d\t%d\t%d\t%d\t%d\t%" PRIu64 "\t%d\t%d\n",
-          query_head,
-          db_getheader(hp->target),
-          hp->id,
-          hp->internal_alignmentlength,
-          hp->mismatches,
-          hp->internal_gaps,
-          qstart,
-          qend,
-          1,
-          db_getsequencelen(hp->target),
-          -1,
-          0);
 }
 
 void results_show_uc_one(FILE * fp,