add null check on parsing svn properties in browsecommand

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 ### Fixed
 - Null Pointer Exception on anonymous migration with deleted repositories ([#1371](https://github.com/scm-manager/scm-manager/pull/1371))
+- Null Pointer Exception on parsing SVN properties ([#1373](https://github.com/scm-manager/scm-manager/pull/1373))
 
 ## [2.7.0] - 2020-10-12
 ### Added

scm-plugins/scm-svn-plugin/src/main/java/sonia/scm/repository/spi/SvnBrowseCommand.java

@@ -193,8 +193,11 @@ public class SvnBrowseCommand extends AbstractSvnCommand
 
       repository.getDir(entry.getRelativePath(), revision, properties, (Collection) null);
 
-      String[] externals = properties.getStringValue(SVNProperty.EXTERNALS).split("\\r?\\n");
-      for (String external : externals) {
+      String externals = properties.getStringValue(SVNProperty.EXTERNALS);
+
+      if (!Strings.isNullOrEmpty(externals)) {
+        String[] splitExternals = externals.split("\\r?\\n");
+        for (String external : splitExternals) {
           String subRepoUrl = "";
           String subRepoPath = "";
           for (String externalPart : external.split(" ")) {
@@ -210,6 +213,8 @@ public class SvnBrowseCommand extends AbstractSvnCommand
             fileObject.addChild(createSubRepoDirectory(subRepository, subRepoPath));
           }
         }
+      }
+
     } catch (SVNException ex) {
       logger.error("could not fetch file properties", ex);
     }