fix if-clause to generate hook-info for 'rc' packages

The code incorrectly skips printing of current version information,
if the package has no current version (for APT, but for dpkg as it is
the case for packages which are removed but not purged) by using an
unintended "else if" rather than an "if".

Closes: 717006

apt-pkg/deb/dpkgpm.cc

@@ -294,7 +294,7 @@ bool pkgDPkgPM::SendPkgsInfo(FILE * const F, unsigned int const &Version)
       if (CurVer.end() == true && (I->Op == Item::Remove || I->Op == Item::Purge))
 	 CurVer = FindNowVersion(I->Pkg);
 
-      else if (CurVer.end() == true)
+      if (CurVer.end() == true)
       {
 	 if (Version <= 2)
 	    fprintf(F, "- ");

test/integration/test-bug-712116-dpkg-pre-install-pkgs-hook-multiarch

@@ -13,6 +13,13 @@ buildsimplenativepackage 'libsame' 'i386,amd64' '2' 'unstable' 'Multi-Arch: same
 buildsimplenativepackage 'stuff' 'i386,amd64' '1' 'stable' 'Depends: libsame (= 1), toolkit (= 1)'
 buildsimplenativepackage 'stuff' 'i386,amd64' '2' 'unstable' 'Depends: libsame (= 2), toolkit (= 2)'
 
+setupsimplenativepackage 'confpkg' 'amd64' '1' 'unstable'
+BUILDDIR='incoming/confpkg-1'
+echo 'foo "bar";' > ${BUILDDIR}/pkg.conf
+echo 'pkg.conf	/etc/pkg.conf' >> ${BUILDDIR}/debian/install
+buildpackage "$BUILDDIR" 'unstable' 'main' 'amd64'
+rm -rf "$BUILDDIR"
+
 setupaptarchive
 
 hook='pre-install-pkgs'
@@ -93,3 +100,21 @@ testfileequal "${hook}-v3.list" 'libsame 2 amd64 same > - - none **REMOVE**
 stuff 2 i386 none > - - none **REMOVE**
 libsame 2 i386 same > - - none **REMOVE**
 toolkit 2 amd64 foreign > - - none **REMOVE**'
+
+observehook install confpkg
+testfileequal "${hook}-v2.list" 'confpkg - < 1 **CONFIGURE**'
+testfileequal "${hook}-v3.list" 'confpkg - - none < 1 amd64 none **CONFIGURE**'
+
+observehook remove confpkg
+testfileequal "${hook}-v2.list" 'confpkg 1 > - **REMOVE**'
+testfileequal "${hook}-v3.list" 'confpkg 1 amd64 none > - - none **REMOVE**'
+
+msgtest 'Conffiles of package remained after remove' 'confpkg'
+dpkg -l confpkg | grep -q '^rc' && msgpass || msgfail
+
+observehook purge confpkg
+testfileequal "${hook}-v2.list" 'confpkg 1 > - **REMOVE**'
+testfileequal "${hook}-v3.list" 'confpkg 1 amd64 none > - - none **REMOVE**'
+
+msgtest 'Conffiles are gone after purge' 'confpkg'
+dpkg -l confpkg 2>/dev/null | grep -q '^rc' && msgfail || msgpass