Update scripts/run to fix crashes running pytest behind a container.

scripts/run

@@ -163,7 +163,7 @@ def get_web2py(args):
         if out:
             for line in out.split("\n"):
                 li = line.split()
-                if args.docker_container == li[-1]:
+                if li and args.docker_container == li[-1]:
                     cmd = [DOCKER,
                            "exec",
                            "-it",
@@ -171,10 +171,10 @@ def get_web2py(args):
                            os.path.join(W2P_CNT, WEB2PY)]
                     return cmd
 
-    print "\n\tweb2py.py is not found !"
-    print "\tDirectory", args.web2py_dir, "don't exists !"
-    print "\tDocker container", args.docker_container, "don't exist !"
-    print "\tTune the option --web2py-dir or --docker-container.\n"
+    print "\n\tweb2py.py is not found on the local host!"
+    print "\tNo directory", args.web2py_dir, "on the local host!"
+    print "\tDocker container", args.docker_container, "is not running!"
+    print "\tStart container or tune option --web2py-dir, --docker-container.\n"
     sys.exit(1)
 
 
@@ -345,11 +345,12 @@ def run_pytest(args):
 
     """
     cmd = ""
+    skip_options = ("docker_container", "func", "path", "shell", "web2py_dir")
 
     # collect active option
     for k, v in vars(args).iteritems():
 
-        if not v or k in ("func", "path", "shell"):
+        if (not v) or (k in skip_options):
             continue
 
         elif k == "capture":