Fixed|libdeng2: IndirectRule's value becomes zero when unset
When the source rule of the indirect rule was removed, the indirectrule did not invalidate itself. Instead, the last value before theunsetting remained in effect.
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Fixed|libdeng2: IndirectRule's value becomes zero when unset
When the source rule of the indirect rule was removed, the indirect
rule did not invalidate itself. Instead, the last value before the
unsetting remained in effect.