#at:append:separator: to ignore empty appends?

Just a suggestion that #at:append:separator: should probably ignore empty
appends,

at: keyString append: aString separator: separatorString
        (aString isNil or: [aString isEmpty]) ifTrue: [^self at: keyString].
        ^self
                at: keyString
                put: (String streamContents:
                                        [:stream |
                                        self
                                                at: keyString
                                                ifPresent:
                                                        [:s |
                                                        stream
                                                                nextPutAll:
s;
                                                                nextPutAll:
separatorString].
                                        stream nextPutAll: aString
displayString])

This would avoid cases like '... class="">' and such,

Cheers!

-Boris

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