Allow blank lines in bed file (#607)

* add ignore zero anchor parameter for skip no matches in batch search

* ignore blank line in bed

jcvi/formats/bed.py

@@ -151,7 +151,7 @@ def __init__(self, filename=None, key=None, sorted=True, juncs=False, include=No
             return
 
         for line in must_open(filename):
-            if line[0] == "#" or (juncs and line.startswith("track name")):
+            if line[0] == "#" or (juncs and line.startswith("track name")) or line.strip()=="":
                 continue
             b = BedLine(line)
             if include and b.accn not in include: