version does not return nil

Author: wchen-r7

modules/exploits/multi/http/glassfish_deployer.rb

@@ -309,11 +309,11 @@ def get_version(res)
     #Set version.  Some GlassFish servers return banner "GlassFish v3".
     if banner =~ /(GlassFish Server|Open Source Edition) (\d\.\d)/
       version = $2
-    elsif banner =~ /GlassFish v(\d)/ and version.nil?
+    elsif banner =~ /GlassFish v(\d)/ and version == 'Unknown'
       version = $1
-    elsif banner =~ /Sun GlassFish Enterprise Server v2/ and version.nil?
+    elsif banner =~ /Sun GlassFish Enterprise Server v2/ and version == 'Unknown'
       version = '2.x'
-    elsif banner =~ /Sun Java System Application Server 9/ and version.nil?
+    elsif banner =~ /Sun Java System Application Server 9/ and version == 'Unknown'
       version = '9.x'
     end