tree: Remove special handling for undefined move endpoint revisions

[alex-pardes]

Description

Removed special case handling for an undefined revision in move endpoints.

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +29 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	457.46 KB	457.5 KB	⯅ +35 Bytes
azureClient.js	555.23 KB	555.28 KB	⯅ +49 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	258.67 KB	258.68 KB	⯅ +14 Bytes
fluidFramework.js	407.07 KB	406.97 KB	⯆ -94 Bytes
loader.js	134.04 KB	134.05 KB	⯅ +14 Bytes
map.js	42.13 KB	42.14 KB	⯅ +7 Bytes
matrix.js	145.61 KB	145.62 KB	⯅ +7 Bytes
odspClient.js	523.37 KB	523.42 KB	⯅ +49 Bytes
odspDriver.js	97.55 KB	97.57 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.61 KB	42.62 KB	⯅ +14 Bytes
sharedString.js	162.62 KB	162.63 KB	⯅ +7 Bytes
sharedTree.js	397.58 KB	397.48 KB	⯆ -101 Bytes
Total Size	3.3 MB	3.3 MB	⯅ +29 Bytes

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Baseline commit: cc075191fb71541b7fe16c33c3114552b9c1d348

Generated by :no_entry_sign: dangerJS against 0a6362133c727ad19f18d4bb234e4be5c55e4a28