Handle search with no arguments.

Fixes Homebrew/homebrew#1514.

1 files changed, 1 insertions, 1 deletions

diff --git a/bin/brew b/bin/brew
index 715daa61a..e9974b16a 100755
--- a/bin/brew
+++ b/bin/brew
@@ -133,7 +133,7 @@ begin
       if ARGV.first =~ /^\/(.*)\/$/
         puts_columns formulae.grep(Regexp.new($1))
       else
-        search_term = Regexp.escape(ARGV.first)
+        search_term = Regexp.escape(ARGV.first || "")
         puts_columns formulae.grep(/.*#{search_term}.*/)
       end