Stop throwing error with empty text

Previous implementation of annotations allowed empty text,
so it is important to keep compatibility with the refactored
builder implementation.

Plan/common/src/main/java/com/djrapitops/plan/extension/implementation/builder/ExtDataBuilder.java

@@ -41,7 +41,7 @@ public class ExtDataBuilder implements ExtensionDataBuilder {
 
     @Override
     public ValueBuilder valueBuilder(String text) {
-        if (text == null || text.isEmpty()) throw new IllegalArgumentException("'text' can't be null or empty");
+        if (text == null) throw new IllegalArgumentException("'text' can't be null");
         return new ExtValueBuilder(text, extension);
     }
 

Plan/common/src/test/java/com/djrapitops/plan/extension/implementation/builder/ExtensionDataBuilderTest.java

@@ -25,25 +25,16 @@ import java.util.Collections;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
-public class ExtendionDataBuilderTest {
+public class ExtensionDataBuilderTest {
     @Test
     void nullTextWhenCreatingValueBuilderThrowsException() {
         ExtDataBuilder builder = new ExtDataBuilder(new Extension());
         assertEquals(
-                "'text' can't be null or empty",
+                "'text' can't be null",
                 assertThrows(IllegalArgumentException.class, () -> builder.valueBuilder(null)).getMessage()
         );
     }
 
-    @Test
-    void emptyTextWhenCreatingValueBuilderThrowsException() {
-        ExtDataBuilder builder = new ExtDataBuilder(new Extension());
-        assertEquals(
-                "'text' can't be null or empty",
-                assertThrows(IllegalArgumentException.class, () -> builder.valueBuilder("")).getMessage()
-        );
-    }
-
     @Test
     void nullClassSupplierNotAdded() {
         ExtDataBuilder builder = new ExtDataBuilder(new Extension());