Vertical clearance not displayed

[DavidGrant-NIWC]

As reported by @TDYCarHugh, the following features will not depict vertical clearance values unless either the featureName attribute or a horizontal clearance attribute is present:

• [x] Gate
• [x] SpanFixed
• [x] SpanOpening
• [x] StructureOverNavigableWater
• [x] Tunnel

Relevant code:

    local featureName = GetFeatureName(feature, contextParameters)
    if featureName or HasHorizontalClearance(feature) then
        featurePortrayal:AddInstructions('LocalOffset:0,0;TextAlignHorizontal:Center;TextAlignVertical:Center;FontColor:CHBLK')
        if featureName then
            featurePortrayal:AddTextInstruction(EncodeString(featureName), 26, 24, viewingGroup, 9)
            PortrayClearances(feature, featurePortrayal, contextParameters, viewingGroup, 0, -3.51)
        else
            PortrayClearances(feature, featurePortrayal, contextParameters, viewingGroup, 0, 0)
        end
    end