Weaving disabled when no instantiations existent

[Matthias Schoettle]

Currently, when there are no instantiations, the weaving is disabled. An error message is displayed, when "weave all" is clicked.

There are two issues with this:

• If a user weaves each instantiations one after the other (single weave), there will be no instantiations at the end, but there might be unwoven message or state views left.
• The code to handle this is located in DisplayAspectScene.actionPerformed(...). But it belongs into the corresponding handler.

[Matthias Schoettle]

A possible solution could be to allow it if there are still aspect message views or unwoven state views present.

Or just allow it, which could just mean that a copy of an already woven aspect is retrieved.

[Matthias Schoettle]

Resolved issue #62: Removed check for instantiations. No check added to DisplaySceneHandler. A more elaborate check would be required to check for unwoven message or state views. For now, a completely woven aspect can be woven again (which just results in a copy).

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