No longer throw error with input '\' in interactive (Azure#6199)

* No longer throw error with input '\'

* Address PR comment

* Fix linting error

* Address PR comment

src/command_modules/azure-cli-interactive/HISTORY.rst

@@ -6,6 +6,7 @@ Release History
 0.3.20
 ++++++
 * Allow interactive completers to function with positional arguments.
+* More user-friendly output when users type '\'
 
 0.3.19
 ++++++

src/command_modules/azure-cli-interactive/azure/cli/command_modules/interactive/azclishell/app.py

@@ -501,7 +501,8 @@ def _special_cases(self, cmd, outside):
         elif SELECT_SYMBOL['query'] in cmd_stripped and self.last and self.last.result:
             continue_flag = self.handle_jmespath_query(args)
             telemetry.track_query_gesture()
-
+        elif not args:
+            continue_flag = True
         elif args[0] == '--version' or args[0] == '-v':
             try:
                 continue_flag = True

src/command_modules/azure-cli-interactive/azure/cli/command_modules/interactive/azclishell/util.py

@@ -8,6 +8,11 @@
 import struct
 import platform
 
+from knack.log import get_logger
+
+
+logger = get_logger(__name__)
+
 
 def get_window_dim():
     """ gets the dimensions depending on python version and os"""
@@ -55,17 +60,13 @@ def parse_quotes(cmd, quotes=True, string=True):
     """ parses quotes """
     import shlex
 
-    if quotes:
-        args = shlex.split(cmd)
-    else:
-        args = cmd.split()
-
-    if string:
-        str_args = []
-        for arg in args:
-            str_args.append(str(arg))
-        return str_args
-    return args
+    try:
+        args = shlex.split(cmd) if quotes else cmd.split()
+    except ValueError as exception:
+        logger.error(exception)
+        return []
+
+    return [str(arg) for arg in args] if string else args
 
 
 def get_os_clear_screen_word():