data generation fails because SecurityService now requires _algorithm to be non-null

[grantr]

Expected Behavior

lean data generate generates market data

Actual Behavior

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at QuantConnect.Securities.SecurityService.InitializeSecurity(Boolean initializeSecurity, Security security, Boolean seedSecurity) in
/LeanCloud/CI.Builder/bin/Release/src/QuantConnect/Lean/Common/Securities/SecurityService.cs:line 346

Potential Solution

This was introduced in #9045. The line if (seedSecurity && _algorithm.Settings.SeedInitialPrices) needs to check if _algorithm is null before using its Settings value.

I confirmed this fix worked by building lean locally and running lean data generate:

if (seedSecurity && _algorithm != null && _algorithm.Settings.SeedInitialPrices)

Reproducing the Problem

lean data generate --start=20260101 --symbol-count=1

Or any lean data generate call will do it.

System Information

Ubuntu 20.04.1 from inside WSL2

Checklist

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