Master is broken (reportlet generation of mgz images)

[oesteban]

As first reported in #1487 (comment), and shown by this crashfile, master is currently broken.

The installed version of nilearn is 0.5.1, as reflected by the installation summary of the pip install --no-cache-dir -r requirements.txt line:

Successfully installed MarkupSafe-1.1.1 PyWavelets-1.0.3 click-7.0 decorator-4.4.0 funcsigs-1.0.2 future-0.17.1 imageio-2.5.0 indexed-gzip-0.8.8 isodate-0.6.0 jinja2-2.10.1 lockfile-0.12.2 lxml-4.3.3 networkx-2.3 neurdflib-5.0.0.post1 nilearn-0.5.1 nipype-1.1.9 niworkflows-0.8.2+8.gb7d111c packaging-19.0 pillow-6.0.0 prov-1.5.3 pydot-1.4.1 pydotplus-2.0.2 pyyaml-5.1 rdflib-4.2.2 scikit-image-0.15.0 seaborn-0.9.0 simplejson-3.16.0 smriprep-0.1.0+18.g423bcc4 svgutils-0.3.1

The version is not further changed:

Requirement already satisfied: nilearn in /usr/local/miniconda/lib/python3.7/site-packages (from fmriprep==1.3.2+28.gba4ebeb3) (0.5.1)

[effigies]

I'd just add !=0.5.0,!=0.5.1 constraints to nilearn.