Fix segfault in Ice and Monteverdi
Summary
Add a default ImageMetadata in the ViewSettings so it doesn't generate a SegFault in case the ImageMetadata is not set.
Rationale
Monteverdi crashs when trying to load a product containing a Sensor Model. This MR fixes this issue
Implementation Details
Classes and files
Add a private ImageMetadata in ViewSettings used for initialization.
Copyright
The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.
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