~10% of healthcheck runs failed with error "Cannot fine property length of undefned"

Summary: According to dashboard, ~10% of healthcheck runs failed with error "Cannot find property length of undefned". So here I'm fixing the only place where length property is used by doctor.

Reviewed By: passy

Differential Revision: D19470886

fbshipit-source-id: 3ad88370e5cb652c6f20034ebf5f38fadc46bf53

doctor/package.json

@@ -1,6 +1,6 @@
 {
   "name": "flipper-doctor",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "description": "Utility for checking for issues with a flipper installation",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",

doctor/src/index.ts

@@ -113,7 +113,10 @@ export function getHealthchecks(): Healthchecks {
                 label: 'SDK Installed',
                 isRequired: true,
                 run: async (e: EnvironmentInfo) => ({
-                  hasProblem: e.SDKs['iOS SDK'].Platforms.length === 0,
+                  hasProblem:
+                    !e.SDKs['iOS SDK'] ||
+                    !e.SDKs['iOS SDK'].Platforms ||
+                    !e.SDKs['iOS SDK'].Platforms.length,
                 }),
               },
               {

package.json

@@ -140,7 +140,7 @@
     "expand-tilde": "^2.0.2",
     "express": "^4.15.2",
     "fb-watchman": "^2.0.0",
-    "flipper-doctor": "^0.6.0",
+    "flipper-doctor": "^0.6.1",
     "fs-extra": "^8.0.1",
     "immer": "^5.2.1",
     "immutable": "^4.0.0-rc.12",

yarn.lock

@@ -4192,10 +4192,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.1.tgz#69e57caa8f0eacbc281d2e2cb458d46fdb449e08"
   integrity sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg==
 
-flipper-doctor@^0.6.0:
-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/flipper-doctor/-/flipper-doctor-0.6.0.tgz#850eaf5e2f7abfb6cb3db0a383f7aa09c35d8176"
-  integrity sha512-aUdsw2b+9oVs/5V3X1TGEETu5TdheriY18pt8PWbhhliln7mUv0dnpvdA02tLlLfHKQ0B07OUrHO/kFaFAfI9Q==
+flipper-doctor@^0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/flipper-doctor/-/flipper-doctor-0.6.1.tgz#7a10cbe655293332c509d3ca37611bc32ee5d514"
+  integrity sha512-XRN5LqTK9J+2K5ixPwEODHYRyfL3hs9qDsKzcPoecoHP2DxPBOJNm2d2+J03lqFMedYE63a6+WhWUXOQoBRyEQ==
   dependencies:
     "@types/node" "^12.12.12"
     envinfo "^7.4.0"