scripts: runners: openocd: Fix empty search path

When enable thread awareness feature for OpenOCD the search path was
converted to a list.  In some environments OPENOCD_DEFAULT_PATH may
not be defined.  That create an empty search path list system fails.
This add a test to skips fill search_args with openocd_search values
when list is empty.

Fixes #38272.

Signed-off-by: Gerson Fernando Budke <[email protected]>

Author: nandojve

scripts/west_commands/runners/openocd.py

@@ -47,8 +47,9 @@ def __init__(self, cfg, pre_init=None, reset_halt_cmd=DEFAULT_OPENOCD_RESET_HALT
                     search_args.append('-s')
                     search_args.append(path.dirname(i))
 
-        for p in cfg.openocd_search:
-            search_args.extend(['-s', p])
+        if cfg.openocd_search is not None:
+            for p in cfg.openocd_search:
+                search_args.extend(['-s', p])
         self.openocd_cmd = [cfg.openocd] + search_args
         # openocd doesn't cope with Windows path names, so convert
         # them to POSIX style just to be sure.