Core/Splines: Fix "velocity > 0.1f" error

Updates #6191.

src/server/game/Movement/MotionMaster.cpp

@@ -337,6 +337,9 @@ void MotionMaster::MoveKnockbackFrom(float srcX, float srcY, float speedXY, floa
     if (_owner->GetTypeId() == TYPEID_PLAYER)
         return;
 
+    if (speedXY <= 0.1f)
+        return;
+
     float x, y, z;
     float moveTimeHalf = speedZ / Movement::gravity;
     float dist = 2 * moveTimeHalf * speedXY;
@@ -370,6 +373,8 @@ void MotionMaster::MoveJumpTo(float angle, float speedXY, float speedZ)
 void MotionMaster::MoveJump(float x, float y, float z, float speedXY, float speedZ, uint32 id)
 {
     TC_LOG_DEBUG("misc", "Unit (GUID: %u) jump to point (X: %f Y: %f Z: %f)", _owner->GetGUIDLow(), x, y, z);
+    if (speedXY <= 0.1f)
+        return;
 
     float moveTimeHalf = speedZ / Movement::gravity;
     float max_height = -Movement::computeFallElevation(moveTimeHalf, false, -speedZ);