Fixups for specs

Author: acammack-r7

lib/metasploit/framework/spec/constants.rb

@@ -20,6 +20,7 @@ module Metasploit::Framework::Spec::Constants
   # and not dynamically loaded code
   PERSISTENT_CHILD_CONSTANT_NAMES = %w{
     Error
+    External
     Loader
     MetasploitClassCompatibilityError
     Namespace

lib/msf/core/modules/external/bridge.rb

@@ -85,8 +85,12 @@ def write_message(fd, json)
   end
 
   def read_json(id, fd)
-    resp = fd.readpartial(10_000)
-    JSON.parse(resp)
+    begin
+      resp = fd.readpartial(10_000)
+      JSON.parse(resp)
+    rescue EOFError => e
+      {}
+    end
   end
 
   def close_ios

lib/msf/core/modules/external/shim.rb

@@ -5,6 +5,7 @@
 class Msf::Modules::External::Shim
   def self.generate(module_path)
     mod = Msf::Modules::External::Bridge.new(module_path)
+    return '' unless mod.meta
     case mod.meta['type']
     when 'remote_exploit.cmd_stager.wget'
       s = remote_exploit_cmd_stager(mod)