Problem with IsomorphismGroups in master

[hungaborhorvath]

Current master has a problem with IsomorphismGroups for the smallest perfect group:

 ┌───────┐   GAP v4.8.3-517-g03e2122 of 2016-04-14 00:20:37 (CEST)
 │  GAP  │   http://www.gap-system.org
 └───────┘   Architecture: x86_64-pc-linux-gnu-gcc-default64
 Libs used:  gmp, readline
 Loading the library and packages ...
 Components: trans 1.0, prim 3.0, small* 1.0, id* 1.0
 Packages:   AClib 1.2, Alnuth 3.0.0, AtlasRep 1.5.1, AutPGrp 1.6, 
             Browse 1.8.6, CRISP 1.4.4, Cryst 4.1.12, CrystCat 1.1.6, 
             CTblLib 1.2.2, FactInt 1.5.3, FGA 1.3.1, GAPDoc 1.5.1, IO 4.4.6, 
             IRREDSOL 1.3.1, LAGUNA 3.7.0, Polenta 1.3.7, Polycyclic 2.11, 
             RadiRoot 2.7, ResClasses 4.5.0, Sophus 1.23, SpinSym 1.5, 
             TomLib 1.2.6, Utils 0.43
 Try '??help' for help. See also '?copyright', '?cite' and '?authors'
gap> G := PerfectGroup(120,1);
A5 2^1
gap> IsomorphismGroups(G, SL(2,5));
Error, no method found! For debugging hints type ?Recovery from NoMethodFound
Error, no 2nd choice method found for `FittingFreeLiftSetup' on 1 arguments at /home/ghorvath/work/gap/lib/methsel2.g:241 called from
FittingFreeLiftSetup( G 
 ) at /home/ghorvath/work/gap/lib/autsr.gi:234 called from
AutomGrpSR( G ) at /home/ghorvath/work/gap/lib/morpheus.gi:1950 called from
AutomorphismGroup( G 
 ); at /home/ghorvath/work/gap/lib/autsr.gi:810 called from
PatheticIsomorphism( G, H 
 ) at /home/ghorvath/work/gap/lib/morpheus.gi:2051 called from
<function "IsomorphismGroups">( <arguments> )
 called from read-eval loop at *stdin*:2
you can 'quit;' to quit to outer loop, or
you can 'return;' to continue
brk> 

This works properly in stable:

 ┌───────┐   GAP 4.8.6, 12-Nov-2016, build of 2016-11-14 18:54:46 (CET)
 │  GAP  │   http://www.gap-system.org
 └───────┘   Architecture: x86_64-pc-linux-gnu-gcc-default64
 Libs used:  gmp, readline
 Loading the library and packages ...
 Components: trans 1.0, prim 2.1, small* 1.0, id* 1.0
 Packages:   AClib 1.2, Alnuth 3.0.0, AtlasRep 1.5.1, AutPGrp 1.6, 
             Browse 1.8.6, CRISP 1.4.4, Cryst 4.1.12, CrystCat 1.1.6, 
             CTblLib 1.2.2, FactInt 1.5.3, FGA 1.3.1, GAPDoc 1.5.1, IO 4.4.6, 
             IRREDSOL 1.3.1, LAGUNA 3.7.0, Polenta 1.3.7, Polycyclic 2.11, 
             RadiRoot 2.7, ResClasses 4.5.0, Sophus 1.23, SpinSym 1.5, 
             TomLib 1.2.6, Utils 0.43
 Try '??help' for help. See also '?copyright', '?cite' and '?authors'
gap> G := PerfectGroup(120,1); 
A5 2^1
gap> IsomorphismGroups(G, SL(2,5));
[ (b^-1*(b^-1*a^-1)^2)^2*(b*(b*a)^2)^2*b^2, b^2 ] -> 
[ [ [ 0*Z(5), Z(5)^2 ], [ Z(5)^0, Z(5)^2 ] ], 
  [ [ Z(5)^2, Z(5)^2 ], [ Z(5)^0, 0*Z(5) ] ] ]
gap> 

@hulpke Can this be caused by #896 ?