Bug 9159 Classpath wizard should not complain when adding missing source folder
Build 20020125 - Define a project A with source folder 'src1'. - Go to the .classpath file and edit it to insert one extra line: <classpathentry kind="src" path="src2"/> below the line referring to first source folder: <classpathentry kind="src" path="src1"/>. - Now, try to add this missing source folder 'src2', it isn't allowed by the wizard, one has to add a basic folder instead. Note: It is not such an uncommon scenario, the classpath modification could simply occur by catching up with a shared classpath having one more source folder on it, and which is locally missing.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/CPListLabelProvider.java
if (cpentry.getSourceAttachmentPath() == null) {
								return fJarIcon;
							} else {
								return fJarWSrcIcon;
							}
						} else {
							return fFolderImage;
						}
					} else {
						return fMissingLibaryImage;
					}
				case IClasspathEntry.CPE_PROJECT:
					if (!cpentry.isMissing()) {
						return fProjectImage;
					} else {
						return fMissingProjectImage;
					}				
				case IClasspathEntry.CPE_VARIABLE:
					if (!cpentry.isMissing()) {
						return fVariableImage;
					} else {
						return fMissingVariableImage;
					}
				default:
											
			}
		}
		return null;
	}
}