-Werror,-Wtautological-undefined-compare

Change-Id: Ib3334c2bc66bd64711542a7d3e84b27900cda53d
-Werror,-Wtautological-undefined-compare

Change-Id: Ibf0abf45f0522c7e887f9ce4567aca647325b9ce
-Werror,-Wundefined-bool-conversion

Change-Id: I13f415f1870d385433c4b9e287c2f5bae170c8ee
Change SfxTabPage::FillItemSet param from ref to pointer

...there were a number of call sites that passed undefined "null pointer
references" (apparently in cases where the passed argument was actually unused)

Change-Id: I19799e90f0cd8e98367782441a5ea9df27b59830