Fixed exception at subprocess call for tcl in setup.py

setup.py

@@ -94,7 +94,7 @@ def check_tcl_version():
     try:
         output = subprocess.check_output("echo \"puts \$tcl_version;exit 0\" | tclsh", shell=True)
         val = float(output)
-    except (TypeError,ValueError):
+    except subprocess.CalledProcessError:
         val = None
     return val