Put typing import into try block

tools/idf_monitor_base/console_parser.py

@@ -13,7 +13,11 @@
 # limitations under the License.
 
 import textwrap
-from typing import Optional
+
+try:
+    from typing import Optional
+except ImportError:
+    pass
 
 import serial.tools.miniterm as miniterm
 

tools/idf_monitor_base/output_helpers.py

@@ -14,7 +14,11 @@
 
 
 import sys
-from typing import Optional
+
+try:
+    from typing import Optional
+except ImportError:
+    pass
 
 # ANSI terminal codes (if changed, regular expressions in LineMatcher need to be udpated)
 ANSI_RED = '\033[1;31m'

tools/idf_monitor_base/stoppable_thread.py

@@ -13,7 +13,11 @@
 # limitations under the License.
 
 import threading
-from typing import Optional
+
+try:
+    from typing import Optional
+except ImportError:
+    pass
 
 
 class StoppableThread(object):