hosts/bsd: check exports only if exports file exists [GH-2714]

CHANGELOG.md

@@ -7,6 +7,8 @@ BUG FIXES:
     registered plugin name [GH-2617]
   - core: Fix exception if an EOFError was somehow raised by Ruby while
     checking a box checksum. [GH-2716]
+  - hosts/bsd: Only run `nfsd checkexports` if there is an exports file.
+    [GH-2714]
 
 ## 1.4.1 (December 18, 2013)
 

plugins/hosts/bsd/host.rb

@@ -36,7 +36,7 @@ module VagrantPlugins
       end
 
       def nfs_export(id, ips, folders)
-        nfs_checkexports!
+        nfs_checkexports! if File.file?("/etc/exports")
 
         # We need to build up mapping of directories that are enclosed
         # within each other because the exports file has to have subdirectories