[views] Remove cubicweb.rtags warnings

When this cube is used without 'addressbook', some relations are not
set.  views.py always sets uicfg tags for those relations, which throws
warnings in cubicweb.rtags.

The solution is to only call uicfg when the 'addressbook' is used.

views.py

@@ -17,25 +17,14 @@ from cubicweb.web.facet import AttributeFacet
 _pvs =uicfg.primaryview_section
 for attr in ('civility', 'firstname', 'surname'):
     _pvs.tag_attribute(('Person', attr), 'hidden')
-for rtype in ('phone', 'use_email',
-              'im_address', 'postal_address'):
-    _pvs.tag_subject_of(('Person', rtype, '*'), 'attributes')
+_pvs.tag_subject_of(('Person', 'use_email', '*'), 'attributes')
 _pvs.tag_subject_of(('Person', 'primary_email', '*'), 'hidden')
 
 _pvdc = uicfg.primaryview_display_ctrl
 _pvdc.tag_attribute(('Person', 'description'),
                     {'showlabel': False, 'order': 0})
-_pvdc.tag_attribute(('Person', 'phone'), {'order': 1, 'vid': 'csv'})
 _pvdc.tag_attribute(('Person', 'use_email'),
                     {'order': 2, 'vid': 'csv', 'label': 'use_email'})
-_pvdc.tag_attribute(('Person', 'im_address'), {'order': 3, 'vid': 'csv'})
-_pvdc.tag_attribute(('Person', 'postal_address'),
-                    {'order': 4, 'vid': 'person.hrs'})
-
-_afs = uicfg.autoform_section
-_afs.tag_subject_of(('Person', 'phone', '*'), 'main', 'inlined')
-_afs.tag_subject_of(('Person', 'postal_address', '*'), 'main', 'inlined')
-_afs.tag_subject_of(('Person', 'im_address', '*'), 'main', 'inlined')
 
 
 class HRSView(baseviews.CSVView):
@@ -122,3 +111,19 @@ class CivilityFacet(AttributeFacet):
     __regid__ = 'civility-facet'
     __select__ = is_instance('Person')
     rtype = 'civility'
+
+
+def registration_callback(vreg):
+    vreg.register_all(globals().values(), __name__)
+    if 'addressbook' in vreg.config.cubes():
+        for rtype in ('phone', 'im_address', 'postal_address'):
+            _pvs.tag_subject_of(('Person', rtype, '*'), 'attributes')
+        _pvdc.tag_attribute(('Person', 'phone'), {'order': 1, 'vid': 'csv'})
+        _pvdc.tag_attribute(('Person', 'im_address'), {'order': 3, 'vid': 'csv'})
+        _pvdc.tag_attribute(('Person', 'postal_address'),
+                            {'order': 4, 'vid': 'person.hrs'})
+
+        _afs = uicfg.autoform_section
+        _afs.tag_subject_of(('Person', 'phone', '*'), 'main', 'inlined')
+        _afs.tag_subject_of(('Person', 'postal_address', '*'), 'main', 'inlined')
+        _afs.tag_subject_of(('Person', 'im_address', '*'), 'main', 'inlined')