noosfero | api: fix image upload for blocks (!1072)

[Victor Costa]

Merge Request !1072 was merged
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/1072
Project:Branches: noosferogov/noosfero:upload-image-blocks to noosfero/noosfero:master
Author: Victor Costa
Assignee: 
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