bug#64350: python-wand-0.6.11 fails in check phase

[Thorsten Wilms]

Hi, python-wand 0.6.11 fails to install. I found this in the log:

phase `add-install-to-path' succeeded after 0.0 seconds
starting phase `wrap'
find-files: /gnu/store/8y1vnzs66bnfgiaxdxhmc7wd9ggkcpy6-python-wand-0.6.11/bin: 
No such file or directory
find-files: 
/gnu/store/8y1vnzs66bnfgiaxdxhmc7wd9ggkcpy6-python-wand-0.6.11/sbin: No such 
file or directory
phase `wrap' succeeded after 0.0 seconds
starting phase `check'
error: in phase 'check': uncaught exception:
unbound-variable #f "Unbound variable: ~S" (tests?) #f 
phase `check' failed after 0.0 seconds
Backtrace:
          10 (primitive-load "/gnu/store/m7pmcj4czzw4pc40s6sfyahq8q9…")
In guix/build/gnu-build-system.scm:
    908:2  9 (gnu-build #:source _ #:outputs _ #:inputs _ #:phases . #)
In ice-9/boot-9.scm:
  1752:10  8 (with-exception-handler _ _ #:unwind? _ # _)
In srfi/srfi-1.scm:
    634:9  7 (for-each #<procedure 7ffff77f40e0 at guix/build/gnu-b…> …)
In ice-9/boot-9.scm:
  1752:10  6 (with-exception-handler _ _ #:unwind? _ # _)
In guix/build/gnu-build-system.scm:
   929:23  5 (_)
In ice-9/eval.scm:
   279:15  4 (_ #(#(#<directory (guile-user) 7ffff77f7c80>) (# # …)))
   223:20  3 (proc #(#(#<directory (guile-user) 7ffff77f7c80>) (# …)))
In unknown file:
           2 (%resolve-variable (7 . tests?) #<directory (guile-user…>)
In ice-9/boot-9.scm:
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Unbound variable: tests?