Empty command line arguments are nearly invisible

[dnet]

Adding an empty command line argument results in a 1 to 2 pixels high entry in the list within the command invocation editor window. If this is the first entry, the command will fail, even though it looks like the first item is OK, while in reality that's the second one, coming after an empty one.

There should be

• a check before automatically adding elements upon using the space bar
• a change in rendering to display empty command line items with the same height as any other
• if the first item is empty, it should be clearly communicated upon saving the command

Thanks to @v-p-b for reporting this.

[dnet]

v0.6.3 is released, which contains this fix