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<value>v1</value> </macro> <macro> <key>m2</key> <value>v2</value> </macro> <macro> <key>m3</key> <value/> </macro> </macros>
for a few macros, doubleclick, ctrl + a, delete is doable.
If you have a lot to clean, you could open the XML view (View => Show Panel => XML) and copy the contents of /context/macros to an editor. You can do advanced replacements there, and then you just copy the result back.
In this example you see that the third key doesn't have a value. So in your editor (capable of regular expression replacement) you would change <value.+/value> to <value/>.