Merge pull request #41 from sticky-note/fix/exports

fix(exports): check if exports is `mapping` before iterating on it

nfs/files/exports

@@ -3,6 +3,6 @@
 # Your changes will be overwritten.
 ########################################################################
 #
-{% for dir, opts in salt['pillar.get']('nfs:server:exports').items() -%}
+{% for dir, opts in salt['pillar.get']('nfs:server:exports', {}).items() -%}
 {{ dir }} {{ opts }}
 {% endfor -%}