fix: Revert fix: check currentValue before generating newValue

lib/workers/repository/process/lookup/generate.ts

@@ -32,21 +32,19 @@ export function generateUpdate(
     }
   }
   const { currentValue } = config;
-  if (currentValue) {
-    try {
-      update.newValue = versioning.getNewValue({
-        currentValue,
-        rangeStrategy,
-        currentVersion,
-        newVersion,
-      });
-    } catch (err) /* istanbul ignore next */ {
-      logger.warn(
-        { err, currentValue, rangeStrategy, currentVersion, newVersion },
-        'getNewValue error'
-      );
-      update.newValue = currentValue;
-    }
+  try {
+    update.newValue = versioning.getNewValue({
+      currentValue,
+      rangeStrategy,
+      currentVersion,
+      newVersion,
+    });
+  } catch (err) /* istanbul ignore next */ {
+    logger.warn(
+      { err, currentValue, rangeStrategy, currentVersion, newVersion },
+      'getNewValue error'
+    );
+    update.newValue = currentValue;
   }
   update.newMajor = versioning.getMajor(newVersion);
   update.newMinor = versioning.getMinor(newVersion);