Fix NPE in MavenLemminxExtension.sortProjects and the similar ones #392
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If a pom.xml file is empty or has inconsstent content, its DOMDocument's Document Element can be null: Cannot invoke "org.eclipse.lemminx.dom.DOMElement.getNodeName()" because the return value of "org.eclipse.lemminx.dom.DOMDocument.getDocumentElement()" is null at org.eclipse.lemminx.extensions.maven.MavenLemminxExtension.lambda$sortProjects$2(MavenLemminxExtension.java:460)
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If a pom.xml file is empty or has inconsstent content, its DOMDocument's Document Element can be null:
Cannot invoke "org.eclipse.lemminx.dom.DOMElement.getNodeName()" because the return value of "org.eclipse.lemminx.dom.DOMDocument.getDocumentElement()" is null
at org.eclipse.lemminx.extensions.maven.MavenLemminxExtension.lambda$sortProjects$2(MavenLemminxExtension.java:460)