Omitting all descs doesn't cause an exception

Fixes #48

lib/support/help.rb

@@ -145,6 +145,7 @@ def output_command_tokens_for_help(tokens,usage_name=:usage)
   # Assumes that the first line doesn't need the padding, as its filled
   # up with other stuff
   def wrap(line,pad_length=0,line_length=nil)
+    line ||= ''
     if line_length.nil?
       line_length = Terminal.instance.size[0]
     end

test/fake_std_out.rb

@@ -1,7 +1,10 @@
 class FakeStdOut
   attr_reader :strings
+
+  def initialize
+    @strings = []
+  end
   def puts(string=nil)
-    @strings ||= []
     @strings << string unless string.nil?
   end
 

test/tc_command.rb

@@ -219,6 +219,17 @@ def test_help_no_global_options
     assert_not_contained(@fake_stdout,/\[global options\]/)
   end
 
+  def test_help_without_any_descs_still_works
+    GLI.reset
+    GLI.flag :f
+    GLI.command :foo do |c|
+    end
+    exit_status = GLI.run(%w(help foo))
+    assert_not_contained(@fake_stderr,/nil/)
+    assert_not_contained(@fake_stdout,/nil/)
+    assert_equal exit_status,0
+  end
+
   def test_help_one_command
     args = %w(help basic)
     GLI.run(args)