chore: remove redundant nil checks

[andig]

len() is defined on nil slices and returns 0, so the paired == nil check is redundant. Likewise, ranging over a nil slice is a no-op, so the guard around it adds nothing.

• features/internal/deviceconfiguration.go — descriptions == nil || len(descriptions) == 0
• usecases/cs/lpc/usecase.go — data.LoadControlLimitData == nil || len(data.LoadControlLimitData) == 0
• usecases/cs/lpp/usecase.go — same
• features/internal/electricalconnection.go — if set.Range != nil { for _, rangeItem := range set.Range { guard removed

The outer data == nil checks are kept — those guard the pointer dereference.

Found with an AST pass over the whole repo rather than a text search, so the set is complete for these shapes: x == nil || len(x) == 0 and x != nil && len(x) > 0 in either operand order and including the < 1 / <= 0 / != 0 / >= 1 spellings, plus nil guards wrapping a range or append on the same value.

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