Ensure that we only try to convert to tags when an equals sign is present.

This fixes #90.

Signed-off-by: Taylor Smock <taylor.smock@kaart.com>

src/main/java/org/openstreetmap/josm/plugins/mapwithai/backend/GetDataRunnable.java

@@ -66,6 +66,9 @@ public class GetDataRunnable extends RecursiveTask<DataSet> {
     private static final int MAX_NUMBER_OF_BBOXES_TO_PROCESS = 1;
     private static final String SERVER_ID_KEY = "current_id";
 
+    /** An equals sign (=) used for tag splitting */
+    private static final String EQUALS = "=";
+
     private static final double ARTIFACT_ANGLE = 0.1745; // 10 degrees in radians
 
     /**
@@ -291,6 +294,7 @@ public class GetDataRunnable extends RecursiveTask<DataSet> {
      */
     public static void replaceTags(DataSet dataSet) {
         final Map<Tag, Tag> replaceTags = MapWithAIPreferenceHelper.getReplacementTags().entrySet().parallelStream()
+                .filter(entry -> entry.getKey().contains(EQUALS) && entry.getValue().contains(EQUALS))
                 .map(entry -> new Pair<>(Tag.ofString(entry.getKey()), Tag.ofString(entry.getValue())))
                 .collect(Collectors.toMap(pair -> pair.a, pair -> pair.b));
         replaceTags(dataSet, replaceTags);

test/unit/org/openstreetmap/josm/plugins/mapwithai/backend/GetDataRunnableTest.java

@@ -3,6 +3,7 @@ package org.openstreetmap.josm.plugins.mapwithai.backend;
 
 import static org.junit.Assume.assumeTrue;
 import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
@@ -134,4 +135,15 @@ public class GetDataRunnableTest {
                         .forEach(node -> assertTrue(node.isDeleted(), "The duplicate way nodes should be deleted")),
                 () -> assertFalse(nonDuplicateWay.isDeleted(), "The non-duplicate way should not be deleted"));
     }
+
+    /**
+     * Non-regression test for <a
+     * href=https://gitlab.com/gokaart/JOSM_MapWithAI/-/issues/90>#90</a>
+     */
+    @Test
+    public void testEmptyTagReplacement() {
+        MapWithAIPreferenceHelper.setReplacementTags(Collections.singletonMap("", ""));
+        DataSet ds = new DataSet();
+        assertDoesNotThrow(() -> GetDataRunnable.replaceTags(ds));
+    }
 }