install: immediately print FormulaUnavailableError.

Library/Homebrew/cmd/install.rb

@@ -206,12 +206,16 @@ module Homebrew
       # formula was found, but there's a problem with its implementation).
       ofail e.message
     rescue FormulaUnavailableError => e
-      if (reason = Homebrew::MissingFormula.reason(e.name))
-        ofail "#{e.message}\n#{reason}"
-      elsif e.name == "updog"
+      if e.name == "updog"
         ofail "What's updog?"
-      else
+        return
+      end
+
       ofail e.message
+      if (reason = Homebrew::MissingFormula.reason(e.name))
+        $stderr.puts reason
+        return
+      end
 
       query = query_regexp(e.name)
 
@@ -246,7 +250,6 @@ module Homebrew
       end
     end
   end
-  end
 
   def check_ppc
     case Hardware::CPU.type