Ignore non-conforming lines

Author: thriqon

invfile.lua.md

@@ -594,14 +594,16 @@ package are generated using the builders.
     for line in io.lines("packages.tsv") do
       if not firstLine then
         local fields = split(line, "\t")
-        local packager = fields[1]
-        local package = fields[2]
-        local revision = fields[3]
-        local test = fields[4]
-        local builddir = "./mulled-build-" .. package
-
-        builders[packager](package, revision, test, builddir)
-        pushTask(package, revision, packager, builddir)
+        if #fields == 4 then
+          local packager = fields[1]
+          local package = fields[2]
+          local revision = fields[3]
+          local test = fields[4]
+          local builddir = "./mulled-build-" .. package
+
+          builders[packager](package, revision, test, builddir)
+          pushTask(package, revision, packager, builddir)
+        end
       end
       firstLine = false
     end