Fix panic in eth_getLogs

[cffls]

Description

Fixes nil pointer dereference bug in filter.

Sample error:

ERROR[10-04|04:21:13.680] RPC method eth_getLogs crashed: runtime error: invalid memory address or nil pointer dereference
goroutine 19346 [running]:
github.com/ethereum/go-ethereum/rpc.(*callback).call.func1()
  /home/ubuntu/bor/rpc/service.go:216 +0x85
panic({0x26d2fa0?, 0x4f70000?})
  /home/ubuntu/.go/src/runtime/panic.go:770 +0x132
github.com/ethereum/go-ethereum/eth/filters.(*FilterAPI).GetLogs(0xc006412f80, {0x3a5b4e8, 0xc0008e3720}, {0x0, 0xc009a33000, 0xc009a33020, {0x54b4880, 0x0, 0x0}, {0x0, ...}})
  /home/ubuntu/bor/eth/filters/api.go:355 +0x5b
reflect.Value.call({0xc00e2795c0?, 0xc00e402c68?, 0x50?}, {0x2af2779, 0x4}, {0xc0008e3a40, 0x3, 0xc0008e3a40?})
  /home/ubuntu/.go/src/reflect/value.go:596 +0xca6
reflect.Value.Call({0xc00e2795c0?, 0xc00e402c68?, 0x1?}, {0xc0008e3a40?, 0x16?, 0x16?})
  /home/ubuntu/.go/src/reflect/value.go:380 +0xb9
github.com/ethereum/go-ethereum/rpc.(*callback).call(0xc00e430960, {0x3a5b4e8, 0xc0008e3720}, {0xc0597dfc00, 0xb}, {0xc0102ebc38, 0x1, 0x4a22af?})
  /home/ubuntu/bor/rpc/service.go:223 +0x36d
github.com/ethereum/go-ethereum/rpc.(*handler).runMethod(0xc00059d2f0?, {0x3a5b4e8?, 0xc0008e3720?}, 0xc00b07ae00, 0x1?, {0xc0102ebc38?, 0xc011ff0da0?, 0x41e738?})
  /home/ubuntu/bor/rpc/handler.go:607 +0x3c
github.com/ethereum/go-ethereum/rpc.(*handler).handleCall(0xc05dfd5a40, 0xc02cf57bc0, 0xc00b07ae00)
  /home/ubuntu/bor/rpc/handler.go:548 +0x22f

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Nodes audience

In case this PR includes changes that must be applied only to a subset of nodes, please specify how you handled it (e.g. by adding a flag with a default value...)

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply
• Created a task in Jira and informed the team for implementation in Erigon client (if applicable)
• Includes RPC methods changes, and the Notion documentation has been updated

Cross repository changes

• This PR requires changes to heimdall
  • In case link the PR here:
• This PR requires changes to matic-cli
  • In case link the PR here:

Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai/amoy
• I have created new e2e tests into express-cli

Manual tests

Please complete this section with the steps you performed if you ran manual tests for this functionality, otherwise delete it

Additional comments

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (v1.5.0-candidate@b35b0e0). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
eth/filters/api.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##             v1.5.0-candidate    #1342   +/-   ##
===================================================
  Coverage                    ?   50.32%           
===================================================
  Files                       ?      769           
  Lines                       ?   125643           
  Branches                    ?        0           
===================================================
  Hits                        ?    63235           
  Misses                      ?    58367           
  Partials                    ?     4041           

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