Purpose:
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When you start designing a page, you get a weird empty page
it was better in v8 with a default message prompting the user to drop a snippet
Specification:
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When a user starts designing a page he/she should get a default message prompting to drop a snippet (like we had it in v8).
[The drag&drop icon must be adapted: now snippets stand in the left side (and not in the upper part)]