fixed assert failure when passing empty array as settings in volume type

Author: glorpen

manifests/volume.pp

@@ -74,7 +74,7 @@
 
   $_transport = "transport ${transport}"
 
-  if $options {
+  if $options and ! empty( $options ) {
     $_options = sort( $options )
   } else {
     $_options = undef

spec/defines/volume_spec.rb

@@ -107,4 +107,16 @@
     it { is_expected.to compile.with_all_deps }
     it { is_expected.to contain_exec("gluster create volume #{title}") }
   end
+  describe 'with empty options' do
+    let(:facts) do
+      {
+        gluster_binary: '/usr/sbin/gluster'
+      }
+    end
+    let(:params) do
+      super().merge(options: [])
+    end
+
+    it { is_expected.to compile.with_all_deps }
+  end
 end