CMake: Only try to find packages dependencies if there are valuesHEADdev

Wrap all _qt_internal_find_third_party_dependencies,
_qt_internal_find_qt_dependencies,
_qt_internal_find_tool_dependencies calls in if statements that check
that the variable holding the dependencies is not empty.

Makes it easier for Qt for MCU project to find the Qt6ToolsTools
package to make the qdoc target available, without having to copy the
cmake files that define
e.g. _qt_internal_find_tool_dependencies.

It should also speed up configuration a tiny bit.

Pick-to: 6.8 6.10
Change-Id: I342f6060e875001d108389170ac05e66e54f0416
Reviewed-by: Joerg Bornemann <[email protected]>

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