Warn if jar file path not in expected form

Author: smowton

java/kotlin-extractor/src/main/java/com/semmle/extractor/java/OdasaOutput.java

@@ -587,6 +587,8 @@ private static long getVirtualFileTimeStamp(VirtualFile vf, Logger log) {
                         else
                             log.warn("Couldn't find timestamp for jar file " + jarFilePath + " entry " + entryPath);
                     }
+                } else {
+                    log.warn("Expected JAR-file path " + vf.getPath() + " to have exactly one '!/' separator");
                 }
             }