minimumSize(): On loading, apparently it can happen that m_pObject is not
set - as witnessed by following crash:

Program received signal SIGSEGV, Segmentation fault.
UMLObject::name (this=0x0) at /trunk/KDE/kdesdk/umbrello/umbrello/umlobject.cpp:185
185 return m_name;
(gdb) bt
#0 UMLObject::name (this=0x0) at /trunk/KDE/kdesdk/umbrello/umbrello/umlobject.cpp:185
#1 0x083213ff in ObjectWidget::minimumSize (this=0x8857d68)
at /trunk/KDE/kdesdk/umbrello/umbrello/widgets/objectwidget.cpp:132
#2 0x0832f3bd in UMLWidget::constrain (this=0x8857d68, width=@0xbfffcafc, height=@0xbfffcaf8)
at /trunk/KDE/kdesdk/umbrello/umbrello/widgets/umlwidget.cpp:257
#3 0x08332add in UMLWidget::clipSize (this=0x8857d68)
at /trunk/KDE/kdesdk/umbrello/umbrello/widgets/umlwidget.cpp:1251
#4 0x0840bc63 in UMLView::loadWidgetsFromXMI (this=0x8854948, qElement=...)
at /trunk/KDE/kdesdk/umbrello/umbrello/umlview.cpp:3464
#5 0x0841d917 in UMLView::loadFromXMI (this=0x8854948, qElement=...)
at /trunk/KDE/kdesdk/umbrello/umbrello/umlview.cpp:3431
#6 0x08369b8e in UMLFolder::loadDiagramsFromXMI (this=0x8642658, diagrams=...)
at /trunk/KDE/kdesdk/umbrello/umbrello/folder.cpp:381
#7 0x0836b2c9 in UMLFolder::load (this=0x8642658, element=...)
at /trunk/KDE/kdesdk/umbrello/umbrello/folder.cpp:473
#8 0x084002cf in UMLObject::loadFromXMI (this=0x8642658, element=...)
at /trunk/KDE/kdesdk/umbrello/umbrello/umlobject.cpp:1067
#9 0x083dbf39 in UMLDoc::loadUMLObjectsFromXMI (this=0x8620670, element=...)
at /trunk/KDE/kdesdk/umbrello/umbrello/umldoc.cpp:2111
#10 0x083dba27 in UMLDoc::loadUMLObjectsFromXMI (this=0x8620670, element=...)
at /trunk/KDE/kdesdk/umbrello/umbrello/umldoc.cpp:2130
#11 0x083dd391 in UMLDoc::loadFromXMI (this=0x8620670, file=..., encode=<value optimized out>)
at /trunk/KDE/kdesdk/umbrello/umbrello/umldoc.cpp:1938
#12 0x083da8a0 in UMLDoc::openDocument (this=0x8620670, url=..., format=0x0)
at /trunk/KDE/kdesdk/umbrello/umbrello/umldoc.cpp:544