java.lang.NumberFormatException: Invalid int: ""

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java.lang.NumberFormatException: Invalid int: ""
at java.lang.Integer.invalidInt(Integer.java:138)
at java.lang.Integer.parseInt(Integer.java:358)
at java.lang.Integer.parseInt(Integer.java:334)
at java.lang.Integer.valueOf(Integer.java:525)
at com.cloud3squared.meteogram.MeteogramService.cacheFileName(MeteogramService.java)

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