scrape.js: Check if property repositories exists

Fixes coala#160

lib/scrape.js

@@ -125,10 +125,9 @@ async function fetchLeaders(id) {
 let repositoryInfo = {}
 async function fetchRepositoryInfo(org) {
   if (repositoryInfo[org]) return repositoryInfo[org]
+  const { data, errors } = await client.query(GITHUB_REPO_INFO_QUERY, { org })
 
-  const { data } = await client.query(GITHUB_REPO_INFO_QUERY, { org })
-
-  if (data) {
+  if (data && data.organization) {
     const info = data.organization.repositories.nodes.map(node => ({
       watchers: node.watchers.nodes,
       stargazers: node.stargazers.nodes,
@@ -139,6 +138,11 @@ async function fetchRepositoryInfo(org) {
 
     return info
   } else {
+    const errorMessage =
+      errors && errors.length ? errors[0].message : 'unknown error'
+    console.warn(
+      `Cannot fetch org ${org} from GitHub, error message: ${errorMessage}`
+    )
     return []
   }
 }
@@ -591,7 +595,11 @@ async function fetchOrgsWithData() {
   const orgWiki = await Promise.all(fetchingWiki)
 
   const fetchingAll = orgs.map(async (org, index) => {
-    await fetchRepositoryInfo(orgGitHub[index])
+    if (orgGitHub[index]) {
+      await fetchRepositoryInfo(orgGitHub[index])
+    } else {
+      console.warn(`Skip ${orgGitHub[index]} value in orgGitHub`)
+    }
 
     const existingOrg = existingData.find(existing => existing.id === org.id)
     const fetchingUsers = orgLeaders[index].map(async user => {