Small xsocsh5 fix.

xsocs/io/XsocsH5.py

@@ -192,10 +192,9 @@ class XsocsH5(XsocsH5Base):
                        'delay']
         with self._get_file() as h5_file:
             path = self.scan_params_tpl.format(entry) + '/{0}'
-            if isinstance(param_names, (list, set, tuple)):
-                return OrderedDict([(param, h5_file.get(path.format(param),
-                                                        _np.array(None))[()])
-                                    for param in param_names])
+            return OrderedDict([(param, h5_file.get(path.format(param),
+                                                    _np.array(None))[()])
+                                for param in param_names])
 
     def positioner(self, entry, positioner):
         path = self.positioners_tpl.format(entry) + '/' + positioner