Fix bug: backintime root crontab doesn't run; missinng line-feed 0x0A on last line (fixes #781)

Author: Germar

CHANGES

@@ -1,6 +1,7 @@
 Back In Time
 
 Version 1.2.0~alpha0
+* Fix bug: backintime root crontab doesn't run; missinng line-feed 0x0A on last line (https://github.com/bit-team/backintime/issues/781)
 * Fix bug: IndexError in inhibitSuspend (https://github.com/bit-team/backintime/issues/772)
 * alleviate default exclude [Tt]rash* (https://github.com/bit-team/backintime/issues/759)
 * enable high DPI scaling (https://github.com/bit-team/backintime/issues/732)

common/tools.py

@@ -1235,7 +1235,7 @@ def writeCrontab(lines):
     assert isinstance(lines, (list, tuple)), 'lines is not list or tuple type: %s' % lines
     with tempfile.NamedTemporaryFile(mode = 'wt') as f:
         f.write('\n'.join(lines))
-        f.write('\n')
+        f.write('\n\n')
         f.flush()
         cmd = ['crontab', f.name]
         proc = subprocess.Popen(cmd,