Fix NPE seen in logs

[laeubi]

java.lang.NullPointerException: Cannot invoke "org.eclipse.pde.api.tools.internal.provisional.model.IApiComponent.getVersion()" because "component" is null
	at org.eclipse.pde.api.tools.internal.model.ApiBaseline.hasSameMMMVersion(ApiBaseline.java:681)
	at org.eclipse.pde.api.tools.internal.model.ApiBaseline.getApiComponent(ApiBaseline.java:673)
	at org.eclipse.pde.api.tools.internal.builder.ApiAnalysisBuilder.buildAll(ApiAnalysisBuilder.java:900)
	at org.eclipse.pde.api.tools.internal.builder.ApiAnalysisBuilder.work(ApiAnalysisBuilder.java:403)
	at org.eclipse.pde.api.tools.internal.builder.ApiAnalysisBuilder.build(ApiAnalysisBuilder.java:383)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:1077)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:296)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:352)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:441)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:444)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:555)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:503)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:585)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:207)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:300)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)