Merge branch 'conditional_forecast' into 'master'

imcforecast.m: Make code robust to 1 period

See merge request !1659
7 jobs for master in 71 minutes and 56 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
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build_binaries

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build_doc

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  Test
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test_dynare++

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passed #5626
test_matlab

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manual #5628
allowed to fail manual
test_octave
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allowed to fail manual
test_old_matlab
 
  Deploy
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secure
deploy_manual_unstable

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