fixed crash - for when a file was mentioned several times

diff --git a/mtail.py b/mtail.py
index f266876..0e5b423 100755 (executable)
--- a/mtail.py
+++ b/mtail.py
@@ -109,7 +109,10 @@ example:
                    self.files[filename]['size']=size
                elif size < offset:
                    self.show_file_when_size_decreased(filename,offset,size)
-               del self.files[filename]['old-file']
+                try:
+                    del self.files[filename]['old-file']
+                except:
+                    pass
            else:
                # enter file with current size
                # if we didn't set format yet, it's because we are initializing