[simulator][rtconfig.py] fix the problem of path cannot be find and cause failure

Some users' computer cannot find the path of VS and will cause failure. Just skip this step.

bsp/simulator/rtconfig.py

@@ -27,19 +27,22 @@ elif  CROSS_TOOL == 'msvc':
     CPU       = 'win32'
     PLATFORM  = 'cl'
     EXEC_PATH = ''
-    vc_version = ''
-    vc_versions = SCons.Tool.MSCommon.vc.get_installed_vcs()
-    if not vc_versions:
-        print("No vc version!")
-        exit(1)
-    else:
-        vc_version = vc_versions[0]
-    EXEC_PATH = SCons.Tool.MSCommon.vc.find_vc_pdir(vc_version)
-    if not EXEC_PATH:
-        print('Installed VC %s failure!' % vc_version)
-        exit(1)
-    else:
-        print('Successfully installed VC %s, path:%s' % (vc_version, EXEC_PATH))
+    try:
+        vc_version = ''
+        vc_versions = SCons.Tool.MSCommon.vc.get_installed_vcs()
+        if not vc_versions:
+            print("No vc version!")
+            exit()
+        else:
+            vc_version = vc_versions[0]
+        EXEC_PATH = SCons.Tool.MSCommon.vc.find_vc_pdir(vc_version)
+        if not EXEC_PATH:
+            print('Installed VC %s failure!' % vc_version)
+            exit()
+        else:
+            print('Successfully installed VC %s, path:%s' % (vc_version, EXEC_PATH))
+    except:
+        pass
 
 else:
     print("Simulator does not support this CROSS TOOL!")