fixes #3017
no fallback if in edit mode for placeholders
fixes #3019
Merge pull request #3022 from digi604/fix-3017

fixes #3017 (less queries in toolbar middleware)
fixed p3 tests
Merge pull request #3024 from digi604/fix-3019

fixes #3019 (redirect to correct site)
fixes correct parent target for right insertion in tree
Merge pull request #3023 from digi604/fix-3020

no fallback if in edit mode for placeholders
fix pyflakes
Merge pull request #3025 from digi604/fix-3021

fixes correct parent target for right insertion in tree