Keep two blank spaces between end of cmnd and next repo (#205)

With the change in the runCmnd() function, you need to add a print("")
statement to keep two blank lines after the end of the command and the next
git repo header output.  I think having two newlines is a good separator
between git repo output.

tribits/python_utils/gitdist.py

@@ -786,6 +786,7 @@ def runCmnd(options, cmnd):
     print(cmnd)
   else:
     subprocess.Popen(cmnd, stdout=sys.stdout, stderr=sys.stderr).communicate()
+    print("")
 
 
 # Determine if a command exists: