Issues with images in Bioc 3.20

[lmweber]

Currently getting some errors related to images in Bioc version 3.20, possibly also related to new function containsOutOfMemoryData() from BiocGenerics. E.g. for Visium_humanDLPFC():

> containsOutOfMemoryData(spe)
Error in h(simpleError(msg, call)) : 
  error in evaluating the argument 'object' in selecting a method for function 'containsOutOfMemoryData': no slot of name "metadata" for this object of class "LoadedSpatialImage"

> str(getImg(spe))
Formal class 'LoadedSpatialImage' [package "SpatialExperiment"] with 2 slots
  ..@ image: 'raster' chr [1:600, 1:600] "#aeb1b0ff" "#aeb2b0ff" "#adb1afff" "#adb1afff" ...
  ..@ NA   : NULL
Warning message:
Not a validObject(): no slot of name "metadata" for this object of class "LoadedSpatialImage" 

[lmweber]

Appears to be possible to fix by rebuilding objects from scratch using current Bioc version -- may need to rebuild and replace all existing EHub objects that have this issue