classify empty lines as 'ignored' unless explicitly matched

common/python/nomadcore/annotator.py

 import logging
+import re
 from nomadcore.match_highlighter import MatchHighlighter, ANSI
 
 
 LOGGER = logging.getLogger(__name__)
 
 
+RE_EMPTY = re.compile(r"^\s*$")
+
+
 class Annotator(object):
     def __init__(self, annotateFilename=None, coverageIgnore=None,
                  formatNameWidth=15, formatSourceWidth=20):
@@ -38,7 +42,7 @@ class Annotator(object):
             return 1
         # classify match
         full = match and match.start() == 0 and match.end() == len(line)
-        ignore = not match and self.coverageIgnore.match(line)
+        ignore = not match and (RE_EMPTY.match(line) or self.coverageIgnore.match(line))
 
         # setup match label
         if match: