Discard invalid required rank

public/data/battlesuits/6s.json

@@ -3,10 +3,7 @@
   "name": "Sixth Serenade",
   "type": "psychic",
   "valkyrie": "kallen",
-  "strengths": [
-    "ice dmg",
-    "freeze"
-  ],
+  "strengths": ["ice dmg", "freeze"],
   "leader": {
     "core": {
       "name": "Phantom Curtain",
@@ -28,13 +25,11 @@
     "subskills": [
       {
         "name": "Switch: Midnight Arrival",
-        "description": "Switch entry directly unleashes a more powerful spinning kick, dealing 120% + 200% ATK of Physical DMG.",
-        "requiredRank": "this"
+        "description": "Switch entry directly unleashes a more powerful spinning kick, dealing 120% + 200% ATK of Physical DMG."
       },
       {
         "name": "QTE: Black Moon",
-        "description": "QTE: triggered upon shield break: shuttles 2 times, each dealing 2x120% ATK of Physical DMG + 480.0% ATK of Ice DMG, and adds 1 Raven Mark to enemies hit. After QTE, tap the [ATK] button to directly perform a Combo ATK without consuming Nachtsicht.",
-        "requiredRank": "this"
+        "description": "QTE: triggered upon shield break: shuttles 2 times, each dealing 2x120% ATK of Physical DMG + 480.0% ATK of Ice DMG, and adds 1 Raven Mark to enemies hit. After QTE, tap the [ATK] button to directly perform a Combo ATK without consuming Nachtsicht."
       },
       {
         "name": "Repentance",
@@ -93,13 +88,11 @@
     "subskills": [
       {
         "name": "Elegy",
-        "description": "Raven Blitz additionally deals 120.0% ATK of Ice DMG, and additionally recovers 100 Nachtsicht for the Valkyrie.",
-        "requiredRank": "this"
+        "description": "Raven Blitz additionally deals 120.0% ATK of Ice DMG, and additionally recovers 100 Nachtsicht for the Valkyrie."
       },
       {
         "name": "Sinner's Eye",
-        "description": "Shortens Raven Blitz CD by 4.00s.",
-        "requiredRank": "this"
+        "description": "Shortens Raven Blitz CD by 4.00s."
       }
     ]
   },
@@ -111,8 +104,7 @@
     "subskills": [
       {
         "name": "Sound of Peace",
-        "description": "When Combo ATKs hit an enemy, deal additional 3x120% ATK of Ice DMG.",
-        "requiredRank": "this"
+        "description": "When Combo ATKs hit an enemy, deal additional 3x120% ATK of Ice DMG."
       },
       {
         "name": "Rogue's Kiss",
@@ -124,4 +116,4 @@
       }
     ]
   }
-}
+}