Description of problem:
$ LANG=C fedora-review -b 1084397
…
WARNING: Illegal return from /usr/share/fedora-review/scripts/generic-large-data.sh, code 80, output: stdout:None stderr:./review-env.sh: line 7: unset: `:DO': not a valid identifier
./review-env.sh: line 7: unset: `:cd': not a valid identifier
./review-env.sh: line 7: unset: `:do': not a valid identifier
./review-env.sh: line 7: unset: `:le': not a valid identifier
./review-env.sh: line 7: unset: `:li#79:co#253:am:xn:xv:LP:sr': not a valid identifier
./review-env.sh: line 7: unset: `:cs': not a valid identifier
./review-env.sh: line 7: unset: `:im': not a valid identifier
./review-env.sh: line 7: unset: `:ke': not a valid identifier
./review-env.sh: line 7: unset: `:ti': not a valid identifier
./review-env.sh: line 7: unset: `:se': not a valid identifier
./review-env.sh: line 7: unset: `:Co#256:pa#64:AF': not a valid identifier
./review-env.sh: line 7: unset: `:vb': not a valid identifier
./review-env.sh: line 7: unset: `:ac': not a valid identifier
./review-env.sh: line 7: unset: `:po': not a valid identifier
./review-env.sh: line 7: unset: `:k3': not a valid identifier
./review-env.sh: line 7: unset: `:k8': not a valid identifier
./review-env.sh: line 7: unset: `:F3': not a valid identifier
./review-env.sh: line 7: unset: `:F7': not a valid identifier
./review-env.sh: line 7: unset: `:K2': not a valid identifier
./review-env.sh: line 7: unset: `:*7': not a valid identifier
./review-env.sh: line 7: unset: `:%e': not a valid identifier
./review-env.sh: line 7: unset: `:@7': not a valid identifier
./review-env.sh: line 7: unset: `:kd': not a valid identifier

It come from line 7 aforementioned script:
unset $(env | sed -n 's/=.*//p')

It does not account what more then one line variables body may be set:
$ env | fgrep -A23 TERMCAP=
TERMCAP=SC|screen|VT 100/ANSI X3.64 virtual terminal:\
        :DO=\E[%dB:LE=\E[%dD:RI=\E[%dC:UP=\E[%dA:bs:bt=\E[Z:\
        :cd=\E[J:ce=\E[K:cl=\E[H\E[J:cm=\E[%i%d;%dH:ct=\E[3g:\
        :do=^J:nd=\E[C:pt:rc=\E8:rs=\Ec:sc=\E7:st=\EH:up=\EM:\
        :le=^H:bl=^G:cr=^M:it#8:ho=\E[H:nw=\EE:ta=^I:is=\E)0:\
        :li#79:co#253:am:xn:xv:LP:sr=\EM:al=\E[L:AL=\E[%dL:\
        :cs=\E[%i%d;%dr:dl=\E[M:DL=\E[%dM:dc=\E[P:DC=\E[%dP:\
        :im=\E[4h:ei=\E[4l:mi:IC=\E[%d@:ks=\E[?1h\E=:\
        :ke=\E[?1l\E>:vi=\E[?25l:ve=\E[34h\E[?25h:vs=\E[34l:\
        :ti=\E[?1049h:te=\E[?1049l:us=\E[4m:ue=\E[24m:so=\E[3m:\
        :se=\E[23m:mb=\E[5m:md=\E[1m:mr=\E[7m:me=\E[m:ms:\
        :Co#256:pa#64:AF=\E[3%dm:AB=\E[4%dm:op=\E[39;49m:AX:\
        :vb=\Eg:G0:as=\E(0:ae=\E(B:\
        :ac=\140\140aaffggjjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~..--++,,hhII00:\
        :po=\E[5i:pf=\E[4i:Km=\E[M:k0=\E[10~:k1=\EOP:k2=\EOQ:\
        :k3=\EOR:k4=\EOS:k5=\E[15~:k6=\E[17~:k7=\E[18~:\
        :k8=\E[19~:k9=\E[20~:k;=\E[21~:F1=\E[23~:F2=\E[24~:\
        :F3=\E[1;2P:F4=\E[1;2Q:F5=\E[1;2R:F6=\E[1;2S:\
        :F7=\E[15;2~:F8=\E[17;2~:F9=\E[18;2~:FA=\E[19;2~:kb=:\
        :K2=\EOE:kB=\E[Z:kF=\E[1;2B:kR=\E[1;2A:*4=\E[3;2~:\
        :*7=\E[1;2F:#2=\E[1;2H:#3=\E[2;2~:#4=\E[1;2D:%c=\E[6;2~:\
        :%e=\E[5;2~:%i=\E[1;2C:kh=\E[1~:@1=\E[1~:kH=\E[4~:\
        :@7=\E[4~:kN=\E[6~:kP=\E[5~:kI=\E[2~:kD=\E[3~:ku=\EOA:\
        :kd=\EOB:kr=\EOC:kl=\EOD:km:

Variant which should solve it:
unset $( env | sed -n 's/=.*//p' | egrep -v '^\s' )

Version-Release number of selected component (if applicable):
$ rpm -q fedora-review
fedora-review-0.5.1-2.fc20.noarch

How reproducible:
Always