ConfigurationBinder source generator shouldn't generate empty methods

[ericstj]

Description

I noticed the following empty method when reviewing the codegen for the repro in #91324

        public static void BindCore(IConfiguration configuration, ref EndPointCollection instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
        {
            foreach (IConfigurationSection section in configuration.GetChildren())
            {
            }
        }

I tried this with an empty class, and it seems we'll skip that, so this might be more specific to collection initialization.

Reproduction Steps

Compile the repro in #91324 when setting <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>.

Observe the generated code.

Expected behavior

Only meaninful methods are generated, methods that do nothing should be avoided.

Actual behavior

Method generated that merely enumerates the configuration children of section.

Regression?

No

Known Workarounds

No response

Configuration

No response

Other information

No response

[ericstj]

This is not necessary for 8.0.