Catch errors in Settings when IS is unreachable

A few bits of Settings try to talk to the IS when Settings is opened. This
changes them to handle failure by logging warnings to the console.

src/components/views/settings/tabs/user/GeneralUserSettingsTab.js

@@ -102,7 +102,17 @@ export default class GeneralUserSettingsTab extends React.Component {
 
         // Need to get 3PIDs generally for Account section and possibly also for
         // Discovery (assuming we have an IS and terms are agreed).
-        const threepids = await getThreepidsWithBindStatus(cli);
+        let threepids = [];
+        try {
+            threepids = await getThreepidsWithBindStatus(cli);
+        } catch (e) {
+            const idServerUrl = MatrixClientPeg.get().getIdentityServerUrl();
+            console.warn(
+                `Unable to reach identity server at ${idServerUrl} to check ` +
+                `for 3PIDs bindings in Settings`,
+            );
+            console.warn(e);
+        }
         this.setState({ emails: threepids.filter((a) => a.medium === 'email') });
         this.setState({ msisdns: threepids.filter((a) => a.medium === 'msisdn') });
     }
@@ -115,16 +125,18 @@ export default class GeneralUserSettingsTab extends React.Component {
 
         // By starting the terms flow we get the logic for checking which terms the user has signed
         // for free. So we might as well use that for our own purposes.
+        const idServerUrl = MatrixClientPeg.get().getIdentityServerUrl();
         const authClient = new IdentityAuthClient();
         const idAccessToken = await authClient.getAccessToken({ check: false });
-        startTermsFlow([new Service(
+        try {
+            await startTermsFlow([new Service(
                 SERVICE_TYPES.IS,
-            MatrixClientPeg.get().getIdentityServerUrl(),
+                idServerUrl,
                 idAccessToken,
             )], (policiesAndServices, agreedUrls, extraClassNames) => {
                 return new Promise((resolve, reject) => {
                     this.setState({
-                   idServerName: abbreviateUrl(MatrixClientPeg.get().getIdentityServerUrl()),
+                        idServerName: abbreviateUrl(idServerUrl),
                         requiredPolicyInfo: {
                             hasTerms: true,
                             policiesAndServices,
@@ -133,14 +145,20 @@ export default class GeneralUserSettingsTab extends React.Component {
                         },
                     });
                 });
-        }).then(() => {
+            });
             // User accepted all terms
             this.setState({
                 requiredPolicyInfo: {
                     hasTerms: false,
                 },
             });
-        });
+        } catch (e) {
+            console.warn(
+                `Unable to reach identity server at ${idServerUrl} to check ` +
+                `for terms in Settings`,
+            );
+            console.warn(e);
+        }
     }
 
     _onLanguageChange = (newLanguage) => {