safety feature

2018-11-21 12:38:04 -05:00 · 2018-11-21 12:38:04 -05:00 · d2707b4f73
commit d2707b4f73
parent 67b80381b6
1 changed files with 2 additions and 0 deletions
--- a/graphics/build.py
+++ b/graphics/build.py
@ -66,6 +66,8 @@ def crunch(n):

 def doit(outfname, fnames):

+    assert fnames, "need some files"
+
    fp = open(outfname, 'wt')

    fp.write("""\