Why not? For all you know, your provider is playing a prank.

Ok that was a joke :D
Why do you expect your code to work? If there is an error (module not installed), you get no output because qx// doesn't capture stderr (``), and if there is no error (module is installed) you get not output because you print nothing. Example

C:\>perl -MCGI -e 1 |hexdump
00000000;

C:\>perl -MCGIs -e 1 |hexdump
Can't locate CGIs.pm in @INC (@INC contains: C:/Perl/lib C:/Perl/site/
+lib .).
BEGIN failed--compilation aborted.
00000000;

C:\>perl -MCGIs -e 1 2>2

C:\>hexdump 2
00000000: 43 61 6E 27 74 20 6C 6F - 63 61 74 65 20 43 47 49 |Can't loc
+ate CGI|
00000010: 73 2E 70 6D 20 69 6E 20 - 40 49 4E 43 20 28 40 49 |s.pm in @
+INC (@I|
00000020: 4E 43 20 63 6F 6E 74 61 - 69 6E 73 3A 20 43 3A 2F |NC contai
+ns: C:/|
00000030: 50 65 72 6C 2F 6C 69 62 - 20 43 3A 2F 50 65 72 6C |Perl/lib 
+C:/Perl|
00000040: 2F 73 69 74 65 2F 6C 69 - 62 20 2E 29 2E 0D 0A 42 |/site/lib
+ .).  B|
00000050: 45 47 49 4E 20 66 61 69 - 6C 65 64 2D 2D 63 6F 6D |EGIN fail
+ed--com|
00000060: 70 69 6C 61 74 69 6F 6E - 20 61 62 6F 72 74 65 64 |pilation 
+aborted|
00000070: 2E 0D 0A                -                         |.  |
00000073;

C:\>
[download]

2>2 redirects stderr to file 2