Bug and crash fixing

[senseiwells]

• Fixes a bug that caused the game to crash when a player uses the gradient with no parameters.

java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 0
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
	at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
	at java.base/java.util.Objects.checkIndex(Objects.java:359)
	at java.base/java.util.ArrayList.get(ArrayList.java:427)
	at eu.pb4.placeholders.api.node.parent.GradientNode$GradientProvider.lambda$colorsHard$1(GradientNode.java:145)
	at eu.pb4.placeholders.impl.GeneralUtils.recursiveGradient(GeneralUtils.java:97)
	at eu.pb4.placeholders.impl.GeneralUtils.toGradient(GeneralUtils.java:65)
	at eu.pb4.placeholders.api.node.parent.GradientNode.applyFormatting(GradientNode.java:69)
	at eu.pb4.placeholders.api.node.parent.ParentNode.toText(ParentNode.java:73)
	at eu.pb4.placeholders.api.node.TextNode.toText(TextNode.java:24)
	at eu.pb4.placeholders.api.parsers.StaticPreParser.parse(StaticPreParser.java:23)
	at eu.pb4.placeholders.api.parsers.StaticPreParser.parseNodes(StaticPreParser.java:18)
	at eu.pb4.placeholders.impl.textparser.MergedParser.parseNodes(MergedParser.java:17)
	at eu.pb4.placeholders.api.parsers.NodeParser.parseNode(NodeParser.java:17)
	at eu.pb4.placeholders.api.parsers.NodeParser.parseNode(NodeParser.java:21)

• Fixed "%player:hunger%" from not working and erroring.
  • Hunger was previously trying to be formatted as a float when it's an integer causing:

  java.util.IllegalFormatConversionException: f != java.lang.Integer
    at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4442) ~[?:?]
    at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2976) ~[?:?]
    at java.util.Formatter$FormatSpecifier.print(Formatter.java:2924) ~[?:?]
    at java.util.Formatter.format(Formatter.java:2689) ~[?:?]
    at java.util.Formatter.format(Formatter.java:2625) ~[?:?]
    at java.lang.String.format(String.java:4141) ~[?:?]
    at eu.pb4.placeholders.impl.placeholder.builtin.PlayerPlaceholders.lambda$register$22(PlayerPlaceholders.java:373) ~[placeholder-api-2.2.0+1.20.2.jar:?]
    at eu.pb4.placeholders.impl.placeholder.PlaceholderNode.toText(PlaceholderNode.java:21) ~[placeholder-api-2.2.0+1.20.2.jar:?]
    at eu.pb4.placeholders.api.node.parent.ParentNode.toText(ParentNode.java:52) ~[placeholder-api-2.2.0+1.20.2.jar:?]
    at eu.pb4.placeholders.api.node.TextNode.toText(TextNode.java:16) ~[placeholder-api-2.2.0+1.20.2.jar:?]