Land rapid7#7305, missing env var fix for Steam module

Author: wvu

modules/post/windows/gather/credentials/steam.rb

@@ -42,12 +42,12 @@ def run
     # We will just use an x64 only defined env variable to check.
     progfiles_env = session.sys.config.getenvs('ProgramFiles(X86)', 'ProgramFiles')
     progfilesx86 = progfiles_env['ProgramFiles(X86)']
-    if not progfilesx86.empty? and progfilesx86 !~ /%ProgramFiles\(X86\)%/
+    if not progfilesx86.blank? and progfilesx86 !~ /%ProgramFiles\(X86\)%/
       progs = progfilesx86 # x64
     else
       progs = progfiles_env['ProgramFiles'] # x86
     end
-    path = progs + '\\Steam\\config'
+    path = "#{progs}\\Steam\\config"
 
     print_status("Checking for Steam configs in #{path}")