fix return File instead of optional when call getFileLeaf

[povolev15]

fix return null instead of optional when call getFileLeaf

Related issue(s):

Fixes #8198

[github-actions]

Node: Unit Test Results

    1 617 files      1 617 suites   17m 13s ⏱️
103 583 tests 103 574 ✔️ 9 💤 0 ❌
109 980 runs  109 971 ✔️ 9 💤 0 ❌

Results for commit 139651b.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Patch coverage: 65.21% and project coverage change: +87.32% 🎉

Comparison is base (d918f8d) 0.00% compared to head (139651b) 87.32%.
Report is 4 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff               @@
##             develop    #8204       +/-   ##
==============================================
+ Coverage           0   87.32%   +87.32%     
- Complexity         0    20517    +20517     
==============================================
  Files              0     1638     +1638     
  Lines              0    63180    +63180     
  Branches           0     6709     +6709     
==============================================
+ Hits               0    55169    +55169     
- Misses             0     6514     +6514     
- Partials           0     1497     +1497     

Files Changed	Coverage Δ
...-app/src/main/java/com/hedera/node/app/Hedera.java	0.00% <0.00%> (ø)
...ce/file/impl/codec/FileServiceStateTranslator.java	91.42% <33.33%> (ø)
...e/app/service/file/impl/ReadableFileStoreImpl.java	100.00% <100.00%> (ø)
.../service/file/impl/handlers/FileAppendHandler.java	87.14% <100.00%> (ø)
.../service/file/impl/handlers/FileDeleteHandler.java	88.88% <100.00%> (ø)
...ce/file/impl/handlers/FileSystemDeleteHandler.java	93.54% <100.00%> (ø)
.../file/impl/handlers/FileSystemUndeleteHandler.java	93.10% <100.00%> (ø)
.../service/file/impl/handlers/FileUpdateHandler.java	96.47% <100.00%> (ø)
...contract/impl/infra/EthereumCallDataHydration.java	100.00% <100.00%> (ø)
...ce/contract/impl/infra/HevmTransactionFactory.java	98.13% <100.00%> (ø)

... and 1628 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
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[github-actions]

Node: E2E Test Results

    1 files      1 suites   19m 5s ⏱️
310 tests 310 ✔️ 0 💤 0 ❌
328 runs  328 ✔️ 0 💤 0 ❌

Results for commit 139651b.

♻️ This comment has been updated with latest results.

[sonarcloud]

SonarCloud Quality Gate failed.   

1 Bug
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

64.1% Coverage
0.0% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[lukelee-sl]

LGTM

[netopyr]

LGTM

[github-actions]

Node: Integration Test Results

278 tests   278 ✔️  32m 21s ⏱️
    5 suites      0 💤
    5 files        0 ❌

Results for commit 139651b.

[AlfredoG87]

LGTM