[societegenerale] Remove a harmless warning

An unimportant warning was being displayed when trying to coerce an image
into an HTMLPage object.
The image is now mapped to a RawPage (not really necessary, as it could also
been left unhandled - but it looks better to have less unhandled pages)
17 jobs from 231-societegenerale-remove-warnings in 0 seconds (queued for 89 minutes and 34 seconds)
Status Job ID Name Coverage
  Build
failed #15707
build:2.7

failed #15693
build:3

failed #15661
build:2.7

failed #15685
build:2.7

failed #15690
build:2.7

failed #15662
build:3

failed #15686
build:3

 
  Test
skipped #15664
allowed to fail
lint:2.7
skipped #15668
allowed to fail
lint:3
skipped #15663
pyflakes:2.7
skipped #15667
pyflakes:3
skipped #15665
unittests:2.7
skipped #15669
unittests:3
skipped #15666
allowed to fail
unittests-modules:2.7
skipped #15670
allowed to fail
unittests-modules:3
 
  Deploy
skipped #15671
doc:2.7
skipped #15672
doc:3
 
Name Stage Failure
failed
build:2.7 Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace
failed
build:3 Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace