Change test to detect something has been sent to stdout

Test something has been rendered by looking at the settings arrays or
lists rather checking stdout channel. (which does not seem to work, as
it returns -1.

modulecmd.tcl.in

@@ -2684,6 +2684,9 @@ proc renderSettings {} {
             puts stdout "import os"
          }
       }
+      set has_rendered 1
+   } else {
+      set has_rendered 0
    }
 
    if {$g_autoInit} {
@@ -3103,7 +3106,8 @@ proc renderSettings {} {
    } elseif {$g_return_false} {
       reportDebug "renderSettings: false value should be returned."
       renderFalse
-   } elseif {[tell stdout]} {
+   } elseif {$has_rendered} {
+      # finish with true statement if something has been put
       renderTrue
    }
 }