Update FlipSocial to v0.7 (#568)

* Update manifest.yml

* Handle NULL pointer

Author: jblanked

applications/GPIO/flip_social/manifest.yml

@@ -2,13 +2,13 @@ sourcecode:
   type: git
   location:
     origin: https://github.com/jblanked/FlipSocial.git
-    commit_sha: 6089cd6a7ed62b94db0a2a24b241cc2e6cf5f6f4
+    commit_sha: 98421a5d04b921ccd8400849ce7ed19b1a728d54
 short_description: "Social media platform for the Flipper Zero."
 description: "@./assets/README.md"
 changelog: "@./assets/CHANGELOG.md"
 author: "JBlanked"
 name: "FlipSocial"
-version: "0.6.3"
+version: "0.7"
 id: "flip_social"
 category: "GPIO"
 targets: ['all']