Do not allow clearing Android logs if the emulator is not running

tools/python/run_adb.py

@@ -13,7 +13,22 @@
 
 def run_adb(android_sdk_root: str, args: typing.List[str]):
     sdk_tool_paths = get_sdk_tool_paths(android_sdk_root)
-    run(sdk_tool_paths.adb, *args)
+    if is_emulator_running(sdk_tool_paths.adb):
+        run(sdk_tool_paths.adb, *args)
+    else:
+        print("No emulator is running.")
+
+
+def is_emulator_running(adb_path) -> bool:
+    result = run(adb_path, "devices", capture_stdout=True)
+    output = result.stdout
+    output_str = output.decode("utf-8").strip()
+    lines = output_str.splitlines()
+    if len(lines) > 1:
+        for line in lines[1:]:
+            if "emulator" in line:
+                return True
+    return False
 
 
 def main():