fix initwrite behaviour

with handlers, a parameter from the cfg file which is not the
first of parameters with the same handler were not written.
fix: write_<param> method is called for all parameters in
<module>.writeDict even if there is no poll entry.

with this fix, when a parameter has the property initwrite=True,
the write_<param> method is called even when <param>
is not polled and even when <module>.pollerClass is None

Change-Id: I9b397deb5b20709fc4fa7c860c85b251a204c7f6

secop/params.py

@@ -115,7 +115,8 @@ class Parameter(Accessible):
                                  settable=False, default=False),
         'handler':     Property('[internal] overload the standard read and write functions',
                                  ValueType(), export=False, default=None, mandatory=False, settable=False),
-        'initwrite':   Property('[internal] write this parameter on initialization (default None: write if given in config)',
+        'initwrite':   Property('[internal] write this parameter on initialization'
+                                ' (default None: write if given in config)',
                                  NoneOr(BoolType()), export=False, default=None, mandatory=False, settable=False),
     }
 
@@ -139,11 +140,8 @@ class Parameter(Accessible):
             datatype.setProperty('unit', unit)
         super(Parameter, self).__init__(**kwds)
 
-        if self.initwrite:
-            if self.readonly:
-                raise ProgrammingError('can not have both readonly and initwrite!')
-            if not self.poll:
-                raise ProgrammingError('only polled parameters can have initwrite!')
+        if self.initwrite and self.readonly:
+            raise ProgrammingError('can not have both readonly and initwrite!')
 
         if self.constant is not None:
             self.properties['readonly'] = True