Fix nil accesses

Author: jvazquez-r7

modules/exploits/multi/http/jboss_bshdeployer.rb

@@ -236,7 +236,7 @@ def query_serverinfo
 
   # Try to autodetect the target platform
   def detect_platform(res)
-    if (res.body =~ /<td.*?OSName.*?(Linux|FreeBSD|Windows).*?<\/td>/m)
+    if res && res.body =~ /<td.*?OSName.*?(Linux|FreeBSD|Windows).*?<\/td>/m
       os = $1
       if (os =~ /Linux/i)
         return 'linux'
@@ -252,7 +252,7 @@ def detect_platform(res)
 
   # Try to autodetect the target architecture
   def detect_architecture(res)
-    if (res.body =~ /<td.*?OSArch.*?(x86|i386|i686|x86_64|amd64).*?<\/td>/m)
+    if res && res.body =~ /<td.*?OSArch.*?(x86|i386|i686|x86_64|amd64).*?<\/td>/m
       arch = $1
       if (arch =~ /(x86|i386|i686)/i)
         return ARCH_X86