Rescue fails with no partition table

Yeah, it's a TODO in the source:

        if [ -z "$PARTITIONS" ]; then
                # TODO: need a sensible error here, or perhaps drop through
                # to a fallback shell?
                log "no partitions found!"
                exit 1
        fi

I've committed a fix for this upstream for rescue 1.16.

This bug was fixed in the package rescue - 1.18

---------------
rescue (1.18) unstable; urgency=low

  [ Updated translations ]
  * Belarusian (be.po) by Pavel Piatruk
  * Bengali (bn.po) by Mahay Alam Khan (মাহে আলম খান)
  * Bosnian (bs.po) by Armin Besirovic
  * Catalan (ca.po) by Jordi Mallach
  * Welsh (cy.po) by Jonathan Price
  * Danish (da.po)
  * German (de.po) by Jens Seidel
  * Greek, Modern (1453-) (el.po)
  * Esperanto (eo.po) by Felipe Castro
  * Spanish (es.po) by Javier Fernández-Sanguino Peña
  * Hebrew (he.po) by Omer Zak
  * Hindi (hi.po) by Kumar Appaiah
  * Croatian (hr.po) by Josip Rodin
  * Hungarian (hu.po) by SZERVÁC Attila
  * Indonesian (id.po) by Arief S Fitrianto
  * Italian (it.po) by Milo Casagrande
  * Georgian (ka.po) by Aiet Kolkhi
  * Central Khmer (km.po) by KHOEM Sokhem
  * Kurdish (ku.po) by Erdal Ronahi
  * Latvian (lv.po) by Aigars Mahinovs
  * Macedonian (mk.po) by Arangel Angov
  * Malayalam (ml.po) by പ്രവീണണ്‍ അരിമ്പ്രത്തൊടിയിലല്‍
  * Nepali (ne.po) by Shiva Prasad Pokharel
  * Dutch (nl.po) by Frans Pop
  * Norwegian Nynorsk (nn.po) by Håvard Korsvoll
  * Panjabi (pa.po) by Amanpreet Singh Alam
  * Polish (pl.po) by Bartosz Fenski
  * Russian (ru.po) by Yuri Kozlov
  * Slovenian (sl.po) by Vanja Cvelbar
  * Albanian (sq.po) by Elian Myftiu
  * Serbian (sr.po) by Veselin Mijušković
  * Tamil (ta.po) by Dr.T.Vasudevan
  * Ukrainian (uk.po) by Євгеній Мещеряков
  * Vietnamese (vi.po) by Clytie Siddall
  * Wolof (wo.po) by Mouhamadou Mamoune Mbacke
  * Simplified Chinese (zh_CN.po) by Deng Xiyue

rescue (1.17) unstable; urgency=low

  [ Jérémy Bobbio ]
  * Use start-shell from di-utils (>= 1.62) to start rescue shells.
    This enables this feature in the graphical installer.

  [ Updated translations ]
  * Arabic (ar.po) by Ossama M. Khayat
  * Belarusian (be.po) by Pavel Piatruk
  * Bulgarian (bg.po) by Damyan Ivanov
  * Czech (cs.po) by Miroslav Kure
  * Dzongkha (dz.po) by Jurmey Rabgay(Bongop) (DIT,BHUTAN)
  * Esperanto (eo.po) by Felipe Castro
  * Basque (eu.po) by Piarres Beobide
  * Finnish (fi.po) by Esko Arajärvi
  * French (fr.po) by Christian Perrier
  * Galician (gl.po) by Jacobo Tarrio
  * Gujarati (gu.po) by Kartik Mistry
  * Japanese (ja.po) by Kenshi Muto
  * Korean (ko.po) by Changwoo Ryu
  * Kurdish (ku.po) by Erdal Ronahi
  * Lithuanian (lt.po) by Kęstutis Biliūnas
  * Malayalam (ml.po) by Praveen|പ്രവീണ്‍ A|എ
  * Marathi (mr.po) by Sampada
  * Norwegian Bokmål (nb.po) by Hans Fredrik Nordhaug
  * Portuguese (pt.po) by Miguel Figueiredo
  * Portuguese (Brazil) (pt_BR.po) by Felipe Augusto van de Wiel (faw)
  * Romanian (ro.po) by Eddy Petrișor
  * Russian (ru.po) by Yuri Kozlov
  * Slovak (sk.po) by Ivan Masár
  * Swedish (sv.po) by Daniel Nylander
  * Thai (th.po) by Theppitak Karoonboonyanan
  * Turkish (tr.po) by Mert Dirik
  * Traditional Chinese (zh_TW.po) by Tetralet

rescue (1.16) unstable; urgency=low

  [ Colin Watson ]
  * Explain the situation and offer a reduced rescue menu if no partitions
    were detected (closes: #318194, LP: #219012).

  [ Updated translations ]
  * Arabic (ar.po) by Ossama M. Khayat
  * Belarusian (be.po) by Pavel Piatruk
  * Bulgarian (bg.po) by D...