Land rapid7#8135, Report hosts always add ip to hostname if hostname is blank

Author: dmohanty-r7

lib/msf/core/db_manager/host.rb

@@ -177,7 +177,9 @@ def report_host(opts)
     end
 
     # Truncate the name field at the maximum field length
-    if opts[:name]
+    if opts[:name].blank?
+      opts[:name] = addr
+    else
       opts[:name] = opts[:name][0,255]
     end