Don't throw exceptions if dependencies can't be pre-calculated (#475)
We observed this issue:
```
INFO - 4abaf6cf-c5e6-4f48-b198-edc124aedf71 - Problem scanning file /tmp/codemodder-project6927415874030968841/app/src/main/java/org/apache/roller/weblogger/util/PasswordUtility.java
INFO - 4abaf6cf-c5e6-4f48-b198-edc124aedf71 - io.codemodder.plugins.maven.MavenProvider$DependencyUpdateException: Failure when retrieving dependencies
INFO - 4abaf6cf-c5e6-4f48-b198-edc124aedf71 - at io.codemodder.plugins.maven.MavenProvider.getAllDependencies(MavenProvider.java:146)
INFO - 4abaf6cf-c5e6-4f48-b198-edc124aedf71 - at io.codemodder.DefaultCodemodExecutor.lambda$execute$0(DefaultCodemodExecutor.java:187)
INFO - 4abaf6cf-c5e6-4f48-b198-edc124aedf71 - at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:273)
INFO - 4abaf6cf-c5e6-4f48-b198-edc124aedf71 - at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
INFO - 4abaf6cf-c5e6-4f48-b198-edc124aedf71 - at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
...
io.codemodder.DefaultCodemodExecutor.lambda$execute$1(DefaultCodemodExecutor.java:188)
edc124aedf71 - Caused by: org.dom4j.DocumentException: Error on line 781 of document : The element type "sequential" must be terminated by the matching end-tag "</sequential>".
```
This error is preventing _analysis_ from occurring, not the updating of
Maven dependencies. We should still run our codemods, even if
dependencies can't be pre-calculated.
