Bug 607083: Improve the error message that install-module.pl prints when

Bugzilla/Install/CPAN.pm

@@ -147,6 +147,9 @@ sub install_module {
     }
 
     my $module = CPAN::Shell->expand('Module', $name);
+    if (!$module) {
+        die install_string('no_such_module', { module => $name }) . "\n";
+    }
     print install_string('install_module', 
               { module => $name, version => $module->cpan_version }) . "\n";
     if ($test) {

template/en/default/setup/strings.txt.pl

@@ -311,6 +311,7 @@ EOT
     module_not_found => "not found",
     module_ok => 'ok',
     module_unknown_version => "found unknown version",
+    no_such_module => "There is no Perl module on CPAN named ##module##.",
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