fix(Tooltip): Fix page crash when content is null

[jurokapsiar]

Fix done by @dalprzemo - https://github.com/microsoft/fluent-ui-react/pull/2210/files

Need to merge it from internal branch as fork branches currently do not work with screener :(

All credit goes to @delprzemo, thanks a lot for the contribution and sorry for not meging your orignial PR...

Fixes #2196

[DustyTheBot]

	Warnings
⚠️	1 perf regressions detected

Perf comparison

Status	Scenario	Fluent TPI	Fabric TPI	Ratio	Iterations	Ticks
🔧	Avatar.Fluent	0.55	0.45	1.22:1	2000	1102
🦄	Button.Fluent	0.13	0.2	0.65:1	1000	130
🔧	Checkbox.Fluent	0.89	0.31	2.87:1	1000	891
🔧	Dialog.Fluent	0.38	0.2	1.9:1	5000	1900
🔧	Dropdown.Fluent	3.88	0.42	9.24:1	1000	3876
🔧	Icon.Fluent	0.13	0.04	3.25:1	5000	673
🦄	Image.Fluent	0.05	0.09	0.56:1	5000	253
🔧	Slider.Fluent	1.62	0.35	4.63:1	1000	1622
🔧	Text.Fluent	0.06	0.02	3:1	5000	298
🦄	Tooltip.Fluent	0.2	19.77	0.01:1	5000	1020

🔧 Needs work     🎯 On target     🦄 Amazing

Potential regressions comparing to master

Scenario	Current PR Ticks	Baseline Ticks	Ratio
Tooltip.Fluent	1020	2131	0.48:1

Perf tests with no regressions

Scenario	Current PR Ticks	Baseline Ticks	Ratio
TableMinimalPerf.default	732	632	1.16:1
Button.Fluent	130	116	1.12:1
StatusMinimalPerf.default	272	248	1.1:1
ItemLayoutMinimalPerf.default	2093	1921	1.09:1
ButtonSlotsPerf.default	717	663	1.08:1
HeaderMinimalPerf.default	514	476	1.08:1
AttachmentMinimalPerf.default	1158	1079	1.07:1
ChatWithPopoverPerf.default	690	645	1.07:1
IconMinimalPerf.default	338	315	1.07:1
ImageMinimalPerf.default	256	239	1.07:1
SliderMinimalPerf.default	1692	1603	1.06:1
TreeMinimalPerf.default	1069	1013	1.06:1
BoxMinimalPerf.default	265	252	1.05:1
DialogMinimalPerf.default	1924	1831	1.05:1
Text.Fluent	298	283	1.05:1
AlertMinimalPerf.default	657	632	1.04:1
CarouselMinimalPerf.default	2245	2154	1.04:1
TextAreaMinimalPerf.default	3446	3315	1.04:1
Checkbox.Fluent	891	859	1.04:1
RadioGroupMinimalPerf.default	455	443	1.03:1
Dialog.Fluent	1900	1844	1.03:1
Icon.Fluent	673	654	1.03:1
AvatarMinimalPerf.default	602	592	1.02:1
DropdownManyItemsPerf.default	474	465	1.02:1
FormMinimalPerf.default	881	862	1.02:1
ProviderMergeThemesPerf.default	1265	1235	1.02:1
ReactionMinimalPerf.default	2831	2774	1.02:1
Image.Fluent	253	249	1.02:1
Slider.Fluent	1622	1592	1.02:1
ChatDuplicateMessagesPerf.default	621	614	1.01:1
HierarchicalTreeMinimalPerf.default	894	885	1.01:1
InputMinimalPerf.default	1018	1004	1.01:1
LabelMinimalPerf.default	1009	995	1.01:1
PortalMinimalPerf.default	242	239	1.01:1
CustomToolbarPrototype.default	4368	4337	1.01:1
ToolbarMinimalPerf.default	846	839	1.01:1
AccordionMinimalPerf.default	220	220	1:1
ButtonMinimalPerf.default	133	133	1:1
ChatMinimalPerf.default	1868	1873	1:1
DividerMinimalPerf.default	1057	1058	1:1
ListCommonPerf.default	843	843	1:1
MenuButtonMinimalPerf.default	1648	1645	1:1
SplitButtonMinimalPerf.default	14132	14141	1:1
Avatar.Fluent	1102	1106	1:1
DropdownMinimalPerf.default	4056	4117	0.99:1
GridMinimalPerf.default	927	935	0.99:1
LoaderMinimalPerf.default	2734	2771	0.99:1
Dropdown.Fluent	3876	3935	0.99:1
ListMinimalPerf.default	302	308	0.98:1
ProviderMinimalPerf.default	642	658	0.98:1
SegmentMinimalPerf.default	1401	1438	0.97:1
AnimationMinimalPerf.default	501	521	0.96:1
CheckboxMinimalPerf.default	3946	4111	0.96:1
HeaderSlotsPerf.default	1500	1555	0.96:1
VideoMinimalPerf.default	782	817	0.96:1
FlexMinimalPerf.default	378	396	0.95:1
LayoutMinimalPerf.default	570	599	0.95:1
MenuMinimalPerf.default	2175	2298	0.95:1
PopupMinimalPerf.default	358	376	0.95:1
RefMinimalPerf.default	159	168	0.95:1
AttachmentSlotsPerf.default	4095	4380	0.93:1
EmbedMinimalPerf.default	7131	7779	0.92:1
TextMinimalPerf.default	290	360	0.81:1
TooltipMinimalPerf.default	1365	2453	0.56:1

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